diff --git a/doc/examples/filtering_video.c b/doc/examples/filtering_video.c
index c02040ae35..5685380ff1 100644
--- a/doc/examples/filtering_video.c
+++ b/doc/examples/filtering_video.c
@@ -38,7 +38,10 @@
 #include <libavfilter/buffersrc.h>
 #include <libavutil/opt.h>
 
-const char *filter_descr = "scale=78:24";
+const char *filter_descr = "scale=78:24,transpose=cclock";
+/* other way:
+   scale=78:24 [scl]; [scl] transpose=cclock // assumes "[in]" and "[out]" to be input output pads respectively
+ */
 
 static AVFormatContext *fmt_ctx;
 static AVCodecContext *dec_ctx;