diff --git a/docs/specs/constants.md b/docs/specs/constants.md
index ecc9368..b04fc90 100644
--- a/docs/specs/constants.md
+++ b/docs/specs/constants.md
@@ -157,6 +157,27 @@
 
 {schema_enum:stroke-dash-type}
 
+<h2 id="matte-mode">Matte Mode</h2>
+
+{schema_string:constants/matte-mode/description}
+
+The value for Luma is calculated accourding to [Rec.709](https://www.itu.int/rec/R-REC-BT.709) standard:
+
+$$Y = 0.2126 R + 0.7152 G + 0.0722 B$$
+
+{schema_enum:matte-mode}
+
+<lottie-playground example="matte.json">
+    <title>Example</title>
+    <form>
+        <enum title="Matte Mode" value="1">matte-mode</enum>
+    </form>
+    <json>{...lottie.layers[1], shapes: [], ks: {}}</json>
+    <script>
+        lottie.layers[1].tt = Number(data["Matte Mode"]);
+    </script>
+</lottie-playground>
+
 <h2 id="gradient-type">Gradient Type</h2>
 
 {schema_string:constants/gradient-type/description}
diff --git a/docs/specs/layers.md b/docs/specs/layers.md
index 58858a9..b9f56f1 100644
--- a/docs/specs/layers.md
+++ b/docs/specs/layers.md
@@ -18,6 +18,42 @@ The `ty` property defines the specific layer type based on the following values:
 
 {schema_object:layers/visual-layer}
 
+
+#### Mattes
+
+A matte allows using a layer as a mask for another layer.
+
+The way it works is the layer defining the mask has a `tt` attribute with the
+appropriate [value](constants.md#matte-mode).
+The layer being masked is indicated by the `tp` attribute, which has the index (`ind`) of the layer that is being masked.
+
+In this example there's a layer with a rectangle and a star being masked by an ellipse:
+
+
+<lottie-playground example="matte.json">
+    <title>Example</title>
+    <form>
+        <input type="checkbox" checked="checked" title="Enable Matte"/>
+        <enum title="Matte Mode" value="1">matte-mode</enum>
+    </form>
+    <json>{...lottie.layers[1], shapes: [], ks: {}}</json>
+    <script>
+        if ( data["Enable Matte"] )
+        {
+            lottie.layers[1].tt = Number(data["Matte Mode"]);
+            lottie.layers[1].tp = 1;
+            lottie.layers[0].td = 1;
+        }
+        else
+        {
+            lottie.layers[1].tt = undefined;
+            lottie.layers[1].tp = undefined;
+            lottie.layers[0].td = undefined;
+        }
+    </script>
+</lottie-playground>
+
+
 ## Layer types
 
 
diff --git a/docs/static/examples/matte.json b/docs/static/examples/matte.json
new file mode 100644
index 0000000..8e49a1e
--- /dev/null
+++ b/docs/static/examples/matte.json
@@ -0,0 +1,390 @@
+{
+"v": "5.5.7",
+"ip": 0,
+"op": 180,
+"nm": "Animation",
+"mn": "{b3d1b083-9de7-4537-a691-fc9aa42f9742}",
+"fr": 60,
+"w": 512,
+"h": 512,
+"assets": [
+],
+"layers": [
+    {
+        "ddd": 0,
+        "ty": 4,
+        "ind": 1,
+        "st": 0,
+        "ip": 0,
+        "op": 180,
+        "nm": "Ellipse (Mask)",
+        "ks": {
+            "a": {
+                "a": 0,
+                "k": [
+                    153,
+                    294
+                ]
+            },
+            "p": {
+                "a": 0,
+                "k": [
+                    346,
+                    211
+                ]
+            },
+            "s": {
+                "a": 0,
+                "k": [
+                    100,
+                    100
+                ]
+            },
+            "r": {
+                "a": 0,
+                "k": 0
+            },
+            "o": {
+                "a": 0,
+                "k": 100
+            }
+        },
+        "shapes": [
+            {
+                "ty": "el",
+                "nm": "Ellipse",
+                "mn": "{261eddeb-af92-4be1-932c-790b00c23933}",
+                "p": {
+                    "a": 0,
+                    "k": [
+                        137.0955223880597,
+                        293.60820895522386
+                    ]
+                },
+                "s": {
+                    "a": 0,
+                    "k": [
+                        303.42089552238804,
+                        315.55074626865667
+                    ]
+                }
+            },
+            {
+                "ty": "st",
+                "nm": "Stroke",
+                "mn": "{aa9c282c-253d-4d8d-ab05-4819c592fa85}",
+                "o": {
+                    "a": 0,
+                    "k": 100
+                },
+                "c": {
+                    "a": 0,
+                    "k": [
+                        1,
+                        1,
+                        1
+                    ]
+                },
+                "lc": 2,
+                "lj": 2,
+                "ml": 0,
+                "w": {
+                    "a": 0,
+                    "k": 6
+                }
+            },
+            {
+                "ty": "fl",
+                "nm": "Fill",
+                "mn": "{2b2b0002-ff0c-4978-a33b-db4e0498848d}",
+                "o": {
+                    "a": 0,
+                    "k": 100
+                },
+                "c": {
+                    "a": 0,
+                    "k": [
+                        0.9411764705882353,
+                        0.11372549019607843,
+                        0.0392156862745098
+                    ]
+                },
+                "r": 1
+            }
+        ],
+        "td": 1
+    },
+    {
+        "ddd": 0,
+        "ty": 4,
+        "ind": 2,
+        "st": 0,
+        "ip": 0,
+        "op": 180,
+        "nm": "Shapes (Masked)",
+        "ks": {
+            "a": {
+                "a": 0,
+                "k": [
+                    256,
+                    256
+                ]
+            },
+            "p": {
+                "a": 0,
+                "k": [
+                    256,
+                    256
+                ]
+            },
+            "s": {
+                "a": 0,
+                "k": [
+                    100,
+                    100
+                ]
+            },
+            "r": {
+                "a": 0,
+                "k": 0
+            },
+            "o": {
+                "a": 0,
+                "k": 100
+            }
+        },
+        "shapes": [
+            {
+                "ty": "gr",
+                "nm": "PolyStar",
+                "mn": "{528994b7-40ff-4d12-81f8-603f274da12e}",
+                "it": [
+                    {
+                        "ty": "sr",
+                        "nm": "PolyStar",
+                        "mn": "{ce8756d7-289f-4f84-a135-d225d57c42e0}",
+                        "p": {
+                            "a": 0,
+                            "k": [
+                                427.2716417910448,
+                                194.29253731343283
+                            ]
+                        },
+                        "or": {
+                            "a": 0,
+                            "k": 216.4160919189453
+                        },
+                        "ir": {
+                            "a": 0,
+                            "k": 87.03440856933594
+                        },
+                        "r": {
+                            "a": 0,
+                            "k": 261.54803466796875
+                        },
+                        "pt": {
+                            "a": 0,
+                            "k": 5
+                        },
+                        "sy": 1,
+                        "os": {
+                            "a": 0,
+                            "k": 0
+                        },
+                        "is": {
+                            "a": 0,
+                            "k": 0
+                        }
+                    },
+                    {
+                        "ty": "st",
+                        "hd": true,
+                        "nm": "Stroke",
+                        "mn": "{efd05a25-a43b-451d-83d2-53a477087223}",
+                        "o": {
+                            "a": 0,
+                            "k": 100
+                        },
+                        "c": {
+                            "a": 0,
+                            "k": [
+                                0,
+                                0.5019607843137255,
+                                1
+                            ]
+                        },
+                        "lc": 2,
+                        "lj": 2,
+                        "ml": 0,
+                        "w": {
+                            "a": 0,
+                            "k": 1
+                        }
+                    },
+                    {
+                        "ty": "fl",
+                        "nm": "Fill",
+                        "mn": "{523ca39c-9e57-4547-bf0e-ba7496003579}",
+                        "o": {
+                            "a": 0,
+                            "k": 100
+                        },
+                        "c": {
+                            "a": 0,
+                            "k": [
+                                0.19607843137254902,
+                                0.3137254901960784,
+                                0.6901960784313725
+                            ]
+                        },
+                        "r": 1
+                    },
+                    {
+                        "ty": "tr",
+                        "a": {
+                            "a": 0,
+                            "k": [
+                                427.2716417910448,
+                                194.29253731343283
+                            ]
+                        },
+                        "p": {
+                            "a": 0,
+                            "k": [
+                                338.7223880597015,
+                                209.76716417910447
+                            ]
+                        },
+                        "s": {
+                            "a": 0,
+                            "k": [
+                                100,
+                                100
+                            ]
+                        },
+                        "r": {
+                            "a": 0,
+                            "k": 0
+                        },
+                        "o": {
+                            "a": 0,
+                            "k": 100
+                        }
+                    }
+                ]
+            },
+            {
+                "ty": "gr",
+                "nm": "Rectangle",
+                "mn": "{d2d7a5d5-6d91-42e8-b40a-af52a112fe38}",
+                "it": [
+                    {
+                        "ty": "rc",
+                        "nm": "Rectangle",
+                        "mn": "{9ef8604e-7891-4909-a655-445131b4d842}",
+                        "p": {
+                            "a": 0,
+                            "k": [
+                                209.17611940298502,
+                                226.8
+                            ]
+                        },
+                        "s": {
+                            "a": 0,
+                            "k": [
+                                363.3313432835821,
+                                369.3492537313433
+                            ]
+                        },
+                        "r": {
+                            "a": 0,
+                            "k": 0
+                        }
+                    },
+                    {
+                        "ty": "st",
+                        "hd": true,
+                        "nm": "Stroke",
+                        "mn": "{444584d2-cb59-4cba-83a1-82cc605837fd}",
+                        "o": {
+                            "a": 0,
+                            "k": 100
+                        },
+                        "c": {
+                            "a": 0,
+                            "k": [
+                                0,
+                                0.5019607843137255,
+                                1
+                            ]
+                        },
+                        "lc": 2,
+                        "lj": 2,
+                        "ml": 0,
+                        "w": {
+                            "a": 0,
+                            "k": 1
+                        }
+                    },
+                    {
+                        "ty": "fl",
+                        "nm": "Fill",
+                        "mn": "{f75aed67-9b0e-41a9-b859-a14b5b0a320d}",
+                        "o": {
+                            "a": 0,
+                            "k": 100
+                        },
+                        "c": {
+                            "a": 0,
+                            "k": [
+                                0.7686274509803922,
+                                0.8509803921568627,
+                                0.9607843137254902
+                            ]
+                        },
+                        "r": 1
+                    },
+                    {
+                        "ty": "tr",
+                        "a": {
+                            "a": 0,
+                            "k": [
+                                256.1910447761194,
+                                273.8149253731343
+                            ]
+                        },
+                        "p": {
+                            "a": 0,
+                            "k": [
+                                256.1910447761194,
+                                273.8149253731343
+                            ]
+                        },
+                        "s": {
+                            "a": 0,
+                            "k": [
+                                100,
+                                100
+                            ]
+                        },
+                        "r": {
+                            "a": 0,
+                            "k": 0
+                        },
+                        "o": {
+                            "a": 0,
+                            "k": 100
+                        }
+                    }
+                ]
+            }
+        ],
+        "tt": 1,
+        "tp": 1
+    }
+],
+"meta": {
+    "g": "Glaxnimate 0.4.6-26-g7b05e75c"
+}
+}
+
diff --git a/schema/constants/matte-mode.json b/schema/constants/matte-mode.json
new file mode 100644
index 0000000..ae837c2
--- /dev/null
+++ b/schema/constants/matte-mode.json
@@ -0,0 +1,33 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "type": "integer",
+    "title": "Matte Mode",
+    "description": "How a layer should mask another layer",
+    "oneOf": [
+        {
+            "title": "Normal",
+            "description": "The layer is not used as a track matte",
+            "const": 0
+        },
+        {
+            "title": "Alpha",
+            "description": "The masked layer opacity is modulated by the track matte layer opacity",
+            "const": 1
+        },
+        {
+            "title": "Inverted Alpha",
+            "description": "The masked layer opacity is modulated by the inverted track matte layer opacity",
+            "const": 2
+        },
+        {
+            "title": "Luma",
+            "description": "The masked layer opacity is modulated by the track matte layer luminance",
+            "const": 3
+        },
+        {
+            "title": "Inverted Luma",
+            "description": "The masked layer opacity is modulated by the inverted track matte layer luminance",
+            "const": 4
+        }
+    ]
+}
diff --git a/schema/layers/visual-layer.json b/schema/layers/visual-layer.json
index 3f870d4..f7ce88a 100644
--- a/schema/layers/visual-layer.json
+++ b/schema/layers/visual-layer.json
@@ -21,6 +21,16 @@
                     "default": 0,
                     "description": "If 1, the layer will rotate itself to match its animated position path"
                 },
+                "tt": {
+                    "title": "Matte Mode",
+                    "$ref": "#/$defs/constants/matte-mode",
+                    "description": "Defines the track matte mode for the layer"
+                },
+                "tp": {
+                    "title": "Matte Parent",
+                    "type": "integer",
+                    "description": "Index of the layer used as matte, if omitted assume the layer above the current one"
+                },
                 "masksProperties": {
                     "title": "Masks",
                     "description": "Optional array of masks for the layer.",