css: Add a comment

All the other color values have this comment,
best to be consistent.

diff --git a/gtk/gtkcssstyleprivate.h b/gtk/gtkcssstyleprivate.h
index 3db7eb150b4fa1f30162fac626d878aba69dd5bb..1ee874d06b4f756a4670163fa1f7dd18c117e154 100644 (file)
--- a/gtk/gtkcssstyleprivate.h
+++ b/gtk/gtkcssstyleprivate.h
@@ -137,7 +137,7 @@ struct _GtkCssOutlineValues {
   GtkCssValue *outline_style;
   GtkCssValue *outline_width;
   GtkCssValue *outline_offset;
-  GtkCssValue *outline_color;
+  GtkCssValue *outline_color; // NULL if currentColor
 };
 
 struct _GtkCssFontValues {