diff --git a/gdk/gdkevents.h b/gdk/gdkevents.h
index 7557c4ca69..b410529fc9 100644
--- a/gdk/gdkevents.h
+++ b/gdk/gdkevents.h
@@ -360,7 +360,7 @@ typedef enum
  * @GDK_SCROLL_LEFT: the window is scrolled to the left.
  * @GDK_SCROLL_RIGHT: the window is scrolled to the right.
  * @GDK_SCROLL_SMOOTH: the scrolling is determined by the delta values
- *   in #GdkEventScroll. See gdk_event_get_scroll_deltas().
+ *   in #GdkEventScroll. See gdk_event_get_scroll_deltas(). Since: 3.4
  *
  * Specifies the direction for #GdkEventScroll.
  */
diff --git a/gdk/gdktypes.h b/gdk/gdktypes.h
index cc4a76e468..2b66e20c0a 100644
--- a/gdk/gdktypes.h
+++ b/gdk/gdktypes.h
@@ -348,8 +348,8 @@ typedef enum
  * @GDK_SUBSTRUCTURE_MASK: receive events about window configuration changes of
  *   child windows
  * @GDK_SCROLL_MASK: receive scroll events
- * @GDK_TOUCH_MASK: receive touch events
- * @GDK_SMOOTH_SCROLL_MASK: receive smooth scrolling events
+ * @GDK_TOUCH_MASK: receive touch events. Since 3.4
+ * @GDK_SMOOTH_SCROLL_MASK: receive smooth scrolling events. Since 3.4
  * @GDK_ALL_EVENTS_MASK: the combination of all the above event masks.
  *
  * A set of bit-flags to indicate which events a window is to receive.