diff --git a/include/SDL3/SDL_events.h b/include/SDL3/SDL_events.h
index cbaccdaa4a..4fb6268135 100644
--- a/include/SDL3/SDL_events.h
+++ b/include/SDL3/SDL_events.h
@@ -830,7 +830,7 @@ typedef struct SDL_PenProximityEvent
     Uint64 timestamp;   /**< In nanoseconds, populated using SDL_GetTicksNS() */
     SDL_WindowID windowID; /**< The window with pen focus, if any */
     SDL_PenID which;        /**< The pen instance id */
-    SDL_PenInputFlags pen_state;   /**< Complete pen input state at time of event */
+    SDL_PenInputFlags pen_state;   /**< Complete pen input state at time of event (added in 3.4.16). */
 } SDL_PenProximityEvent;
 
 /**