diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
index c03bae906787..4179241e5e7c 100644
--- a/include/uapi/drm/amdgpu_drm.h
+++ b/include/uapi/drm/amdgpu_drm.h
@@ -445,7 +445,7 @@ union drm_amdgpu_cs {
 /* This IB should be submitted to CE */
 #define AMDGPU_IB_FLAG_CE	(1<<0)
 
-/* CE Preamble */
+/* Preamble flag, which means the IB could be dropped if no context switch */
 #define AMDGPU_IB_FLAG_PREAMBLE (1<<1)
 
 struct drm_amdgpu_cs_chunk_ib {