diff --git a/doc/examples/scaling_video.c b/doc/examples/scaling_video.c
index 61c5e8b76d..4d686c8803 100644
--- a/doc/examples/scaling_video.c
+++ b/doc/examples/scaling_video.c
@@ -20,6 +20,11 @@
  * THE SOFTWARE.
  */
 
+/**
+ * @file
+ * libswscale API use example.
+ */
+
 #include <libavutil/imgutils.h>
 #include <libavutil/parseutils.h>
 #include <libswscale/swscale.h>