diff --git a/include/SDL3/SDL_log.h b/include/SDL3/SDL_log.h
index 2ae0963c2b..f193abfb3b 100644
--- a/include/SDL3/SDL_log.h
+++ b/include/SDL3/SDL_log.h
@@ -487,7 +487,8 @@ typedef void (SDLCALL *SDL_LogOutputFunction)(void *userdata, int category, SDL_
 /**
  * Get the default log output function.
  *
- * \returns the default log output callback.
+ * \returns the default log output callback. It should be called with NULL for
+ *          the userdata argument.
  *
  * \threadsafety It is safe to call this function from any thread.
  *