diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index c40cfe2e63ab333a5dfa4225396d4f120cdfe537..3e5f52110ea17384c84f568ba9b1a4955922523c 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1158,6 +1158,7 @@ EXPORT_SYMBOL(drm_dp_psr_setup_time);
 /**
  * drm_dp_start_crc() - start capture of frame CRCs
  * @aux: DisplayPort AUX channel
+ * @crtc: CRTC displaying the frames whose CRCs are to be captured
  *
  * Returns 0 on success or a negative error code on failure.
  */