diff --git a/codes/ecg-image-generator/template1.json b/codes/ecg-image-generator/template1.json
index 0e43276..33f9011 100644
--- a/codes/ecg-image-generator/template1.json
+++ b/codes/ecg-image-generator/template1.json
@@ -22,7 +22,12 @@
             },
             "lead_name": "",
             "start_sample": 0,
-            "end_sample": 0
+            "end_sample": 0,
+            "plotted_pixels":
+            [
+                [0, 0],
+                [0, 0]
+            ]
         } 
     ]
 }
diff --git a/codes/ecg-image-generator/template2.json b/codes/ecg-image-generator/template2.json
index 177faa3..2897e5f 100644
--- a/codes/ecg-image-generator/template2.json
+++ b/codes/ecg-image-generator/template2.json
@@ -36,7 +36,12 @@
             },
             "lead_name": "",
             "start_sample": 0,
-            "end_sample": 0
+            "end_sample": 0,
+            "plotted_pixels":
+            [
+                [0, 0],
+                [0, 0]
+            ]
         } 
     ],
     "x_grid": 0,