diff --git a/app/src/main/java/com/forrestguice/suntimeswidget/calendar/ui/AboutDialog.java b/app/src/main/java/com/forrestguice/suntimeswidget/calendar/ui/AboutDialog.java
index 52aab50..4d6c5d7 100644
--- a/app/src/main/java/com/forrestguice/suntimeswidget/calendar/ui/AboutDialog.java
+++ b/app/src/main/java/com/forrestguice/suntimeswidget/calendar/ui/AboutDialog.java
@@ -36,6 +36,8 @@
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.CheckBox;
+import android.widget.CompoundButton;
 import android.widget.TextView;
 
 import com.forrestguice.suntimescalendars.BuildConfig;
@@ -147,6 +149,18 @@ public void onClick(View v)
         supportView.setMovementMethod(LinkMovementMethod.getInstance());
         supportView.setText(Utils.fromHtml(context.getString(R.string.app_support_url)));
 
+        final TextView donateView = (TextView) dialogContent.findViewById(R.id.text_about_donate);
+        donateView.setMovementMethod(LinkMovementMethod.getInstance());
+        donateView.setText(Utils.fromHtml(context.getString(R.string.app_donate_url, context.getString(R.string.app_name))));
+        donateView.setVisibility(View.GONE);
+
+        CheckBox checkDonate = (CheckBox) dialogContent.findViewById(R.id.check_donate);
+        checkDonate.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+                donateView.setVisibility(isChecked ? View.VISIBLE : View.GONE);
+            }
+        });
+
         TextView legalView1 = (TextView) dialogContent.findViewById(R.id.txt_about_legal1);
         legalView1.setMovementMethod(LinkMovementMethod.getInstance());
         legalView1.setText(Utils.fromHtml(context.getString(R.string.app_legal1)));
diff --git a/app/src/main/res/layout/layout_dialog_about.xml b/app/src/main/res/layout/layout_dialog_about.xml
index e64c552..76e6792 100644
--- a/app/src/main/res/layout/layout_dialog_about.xml
+++ b/app/src/main/res/layout/layout_dialog_about.xml
@@ -96,16 +96,39 @@
                 android:textSize="?attr/text_size_small" android:text="@string/app_legal1"
                 android:autoLink="web" />
 
-            <TextView
-                android:id="@+id/txt_about_url"
-                android:layout_marginStart="5dp"
-                android:layout_marginLeft="5dp"
-                android:layout_marginBottom="2dp"
-                android:layout_marginTop="0dp"
-                android:layout_height="wrap_content"
-                android:layout_width="wrap_content"
-                android:textSize="?attr/text_size_small" android:text="@string/app_url"
-                android:autoLink="web" />
+            <LinearLayout android:orientation="horizontal"
+                android:layout_width="match_parent" android:layout_height="wrap_content"
+                android:layout_marginBottom="2dp" android:layout_marginTop="4dp"
+                android:layout_marginEnd="8dp" android:layout_marginRight="8dp"
+                android:layout_marginStart="8dp" android:layout_marginLeft="8dp"
+                android:animateLayoutChanges="true">
+
+                <android.support.v7.widget.AppCompatCheckBox
+                    android:id="@+id/check_donate"
+                    android:layout_height="wrap_content" android:layout_width="wrap_content"
+                    android:gravity="center_vertical" android:layout_gravity="center_vertical|start"
+                    android:button="?attr/checkFavorite" android:paddingLeft="8dp"
+                    android:checked="false"
+                    tools:ignore="@string/expandMore" />
+
+                <LinearLayout android:orientation="vertical"
+                    android:layout_width="wrap_content" android:layout_height="wrap_content"
+                    android:animateLayoutChanges="true">
+
+                    <TextView android:id="@+id/text_about_donate"
+                        android:layout_height="wrap_content" android:layout_width="wrap_content"
+                        android:textSize="?attr/text_size_small" android:layout_marginBottom="4dp"
+                        android:text="@string/app_donate_url" />
+
+                    <TextView
+                        android:id="@+id/txt_about_url"
+                        android:layout_height="wrap_content" android:layout_width="wrap_content"
+                        android:textSize="?attr/text_size_small" android:text="@string/app_url"
+                        android:autoLink="web" />
+
+                </LinearLayout>
+
+            </LinearLayout>
 
             <TextView
                 android:id="@+id/txt_about_legal2"
diff --git a/app/src/main/res/values-eo/strings.xml b/app/src/main/res/values-eo/strings.xml
index 1190595..caebb73 100644
--- a/app/src/main/res/values-eo/strings.xml
+++ b/app/src/main/res/values-eo/strings.xml
@@ -300,6 +300,10 @@
         <b>Subteno:</b> vizitu la
         <a href="https://github.com/forrestguice/SuntimesCalendars/issues">erar‑spurilon</a> por raporti problemon.
     ]]></string>
+    <string name="app_donate_url"><![CDATA[
+        La aplikaĵo %s estas disponebla senpage, sed se ĝi utilas al vi, bonvolu
+        <a href="https://forrestguice.github.io/SuntimesWidget/donate">konsideri donaci ajnan monkvanton</a>.
+    ]]></string>
     <string name="app_legal1"><![CDATA[
         Aŭtorrajto &#169 2018-2024 Forrest GUICE <br />
         Fontkodo disponebla laŭ la permesilo GPLv3.
diff --git a/app/src/main/res/values-pl/strings.xml b/app/src/main/res/values-pl/strings.xml
index 3e0627e..5ef72fd 100644
--- a/app/src/main/res/values-pl/strings.xml
+++ b/app/src/main/res/values-pl/strings.xml
@@ -298,6 +298,10 @@
     <string name="app_version"><![CDATA[<b>Wersja:</b>]]> <xliff:g id="versionString">%s</xliff:g></string>
     <string name="app_shortdesc">Dodatek do apki Czasy Słońca: integracja z kalendarzem.</string>
     <string name="app_support_url"><![CDATA[<b>Wsparcie:</b> odwiedź <a href="https://github.com/forrestguice/SuntimesCalendars/issues">stronę trackera błędów</a> aby zgłosić błąd/sugestię.]]></string>
+    <string name="app_donate_url"><![CDATA[
+        Aplikacja %s jest udostępniana bezpłatnie, ale jeżeli jest ona dla Ciebie użyteczna, prosimy
+        <a href="https://forrestguice.github.io/SuntimesWidget/donate">rozważyć wpłatę dowolnej kwoty</a>.
+    ]]></string>
     <string name="app_legal1"><![CDATA[Prawo autorskie &#169 2018–2024 Forrest Guice <br />Kod źródłowy dostępny na licencji GPLv3.]]></string>
     <string name="app_legal2"><![CDATA[
         <b>Tłumaczenia:</b><br/>
diff --git a/app/src/main/res/values-zh-rTW/strings.xml b/app/src/main/res/values-zh-rTW/strings.xml
index bc76e37..d590e68 100644
--- a/app/src/main/res/values-zh-rTW/strings.xml
+++ b/app/src/main/res/values-zh-rTW/strings.xml
@@ -146,6 +146,10 @@
         <b>Support:</b> visit the
         <a href="https://github.com/forrestguice/SuntimesWidget/issues">issue tracker</a> to submit a request.
     ]]></string>
+    <string name="app_donate_url"><![CDATA[
+        %s 免費使用，如果您認為它有價值，請
+        <a href="https://forrestguice.github.io/SuntimesWidget/donate">隨意付費</a>。
+    ]]></string>
     <string name="app_url"><xliff:g id="url"><![CDATA[
         <a href="https://forrestguice.github.io/SuntimesWidget/">forrestguice.github.io/SuntimesWidget</a>
     ]]></xliff:g></string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 54973ab..a30e0a0 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -433,6 +433,10 @@
     <string name="app_url"><xliff:g id="url"><![CDATA[
         <a href="https://forrestguice.github.io/SuntimesWidget/">forrestguice.github.io/SuntimesWidget</a>
     ]]></xliff:g></string>
+    <string name="app_donate_url"><![CDATA[
+        %s is available gratis, but if it has proven its value, please
+        <a href="https://forrestguice.github.io/SuntimesWidget/donate">pay as you like</a>.
+    ]]></string>
     <string name="app_legal1"><![CDATA[
         <b>Source Code:</b><br />
         Copyright &#169 2018-2024 Forrest Guice <br />