diff --git a/src/appicon.c b/src/appicon.c
index 6be30577..77c5e304 100644
--- a/src/appicon.c
+++ b/src/appicon.c
@@ -1018,6 +1018,7 @@ static void remove_from_appicon_list(WScreen *scr, WAppIcon *appicon)
 	appicon->next = NULL;
 }
 
+/* Return the AppIcon associated with a given (Xlib) Window. */
 WAppIcon *wAppIconFor(Window window)
 {
 	WObjDescriptor *desc;
diff --git a/src/window.c b/src/window.c
index 4691021f..199613c7 100644
--- a/src/window.c
+++ b/src/window.c
@@ -141,6 +141,7 @@ static void appearanceObserver(void *self, WMNotification * notif)
 }
 
 
+/* Return the WWindow associated with a given (Xlib) Window. */
 WWindow *wWindowFor(Window window)
 {
 	WObjDescriptor *desc;