diff --git a/gtk2_ardour/themes/blueberry-milk-ardour.colors b/gtk2_ardour/themes/blueberry-milk-ardour.colors
index c61a130fe5..9c37596b59 100755
--- a/gtk2_ardour/themes/blueberry-milk-ardour.colors
+++ b/gtk2_ardour/themes/blueberry-milk-ardour.colors
@@ -139,6 +139,7 @@
     <ColorAlias name="clock: cursor" alias="color 8"/>
     <ColorAlias name="clock: edited text" alias="color 8"/>
     <ColorAlias name="clock: text" alias="color 13"/>
+    <ColorAlias name="comment button: fill" alias="color 20"/>
     <ColorAlias name="control point fill" alias="color 17"/>
     <ColorAlias name="control point outline" alias="meter color3"/>
     <ColorAlias name="control point selected fill" alias="color 62"/>
diff --git a/gtk2_ardour/themes/caineville-ardour.colors b/gtk2_ardour/themes/caineville-ardour.colors
index c721305831..f4ed1dfca9 100755
--- a/gtk2_ardour/themes/caineville-ardour.colors
+++ b/gtk2_ardour/themes/caineville-ardour.colors
@@ -139,6 +139,7 @@
     <ColorAlias name="clock: cursor" alias="color 8"/>
     <ColorAlias name="clock: edited text" alias="color 8"/>
     <ColorAlias name="clock: text" alias="color 12"/>
+    <ColorAlias name="comment button: fill" alias="color 20"/>
     <ColorAlias name="control point fill" alias="color 97"/>
     <ColorAlias name="control point outline" alias="meter color8"/>
     <ColorAlias name="control point selected fill" alias="color 13"/>
diff --git a/gtk2_ardour/themes/cubasish-ardour.colors b/gtk2_ardour/themes/cubasish-ardour.colors
index 2421e0adfe..e3059f000c 100755
--- a/gtk2_ardour/themes/cubasish-ardour.colors
+++ b/gtk2_ardour/themes/cubasish-ardour.colors
@@ -139,6 +139,7 @@
     <ColorAlias name="clock: cursor" alias="color 8"/>
     <ColorAlias name="clock: edited text" alias="color 8"/>
     <ColorAlias name="clock: text" alias="color 12"/>
+    <ColorAlias name="comment button: fill" alias="color 20"/>
     <ColorAlias name="control point fill" alias="color 4"/>
     <ColorAlias name="control point outline" alias="color 58"/>
     <ColorAlias name="control point selected fill" alias="color 13"/>
diff --git a/gtk2_ardour/themes/unostudia.colors b/gtk2_ardour/themes/unostudia.colors
index 2f32da580e..48c5f2ac3a 100644
--- a/gtk2_ardour/themes/unostudia.colors
+++ b/gtk2_ardour/themes/unostudia.colors
@@ -144,6 +144,7 @@
 		<ColorAlias name="clock: cursor" alias="color 8"/>
 		<ColorAlias name="clock: edited text" alias="color 8"/>
 		<ColorAlias name="clock: text" alias="color 1"/>
+		<ColorAlias name="comment button: fill" alias="color 20"/>
 		<ColorAlias name="control point fill" alias="color 17"/>
 		<ColorAlias name="control point outline" alias="meter color3"/>
 		<ColorAlias name="control point selected fill" alias="color 72"/>