diff --git a/src/cairo-surface.c b/src/cairo-surface.c
index 062c269c5..4c77de7c8 100644
--- a/src/cairo-surface.c
+++ b/src/cairo-surface.c
@@ -1224,6 +1224,9 @@ slim_hidden_def (cairo_surface_set_mime_data);
  *
  * Return whether @surface supports @mime_type.
  *
+ * Return value: %TRUE if @surface supports
+ *               @mime_type, %FALSE otherwise
+ *
  * Since: 1.12
  **/
 cairo_bool_t