diff --git a/libavcodec/dct-test.c b/libavcodec/dct-test.c
index 409996f46f..3bd95fdf2d 100644
--- a/libavcodec/dct-test.c
+++ b/libavcodec/dct-test.c
@@ -511,10 +511,11 @@ static void idct248_error(const char *name,
 
 static void help(void)
 {
-    printf("dct-test [-i] [<test-number>]\n"
+    printf("dct-test [-i] [<test-number>] [<bits>]\n"
            "test-number 0 -> test with random matrixes\n"
            "            1 -> test with random sparse matrixes\n"
            "            2 -> do 3. test from mpeg4 std\n"
+           "bits        Number of time domain bits to use, 8 is default\n"
            "-i          test IDCT implementations\n"
            "-4          test IDCT248 implementations\n"
            "-t          speed test\n");