diff --git a/include/SDL_surface.h b/include/SDL_surface.h
index 5325ed201..0634ab9d3 100644
--- a/include/SDL_surface.h
+++ b/include/SDL_surface.h
@@ -818,6 +818,8 @@ extern DECLSPEC int SDLCALL SDL_SoftStretch(SDL_Surface * src,
 
 /**
  * Perform bilinear scaling between two surfaces of the same format, 32BPP.
+ *
+ * \since This function is available since SDL 2.0.16.
  */
 extern DECLSPEC int SDLCALL SDL_SoftStretchLinear(SDL_Surface * src,
                                             const SDL_Rect * srcrect,
diff --git a/include/SDL_video.h b/include/SDL_video.h
index 93e16592f..9803b417e 100644
--- a/include/SDL_video.h
+++ b/include/SDL_video.h
@@ -1209,6 +1209,8 @@ extern DECLSPEC void SDLCALL SDL_SetWindowGrab(SDL_Window * window,
  * \param window The window for which the keyboard grab mode should be set.
  * \param grabbed This is SDL_TRUE to grab keyboard, and SDL_FALSE to release.
  *
+ * \since This function is available since SDL 2.0.16.
+ *
  * \sa SDL_GetWindowKeyboardGrab
  * \sa SDL_SetWindowMouseGrab
  * \sa SDL_SetWindowGrab