diff --git a/include/d3dtypes.h b/include/d3dtypes.h
index 75aee5508ec..fe7f3b25e6e 100644
--- a/include/d3dtypes.h
+++ b/include/d3dtypes.h
@@ -867,6 +867,7 @@ typedef enum {
   D3DRENDERSTATE_FOGEND             = 37,
   D3DRENDERSTATE_FOGDENSITY         = 38,
   D3DRENDERSTATE_STIPPLEENABLE      = 39,
+  /* d3d5 */
   D3DRENDERSTATE_EDGEANTIALIAS      = 40,
   D3DRENDERSTATE_COLORKEYENABLE     = 41,
   D3DRENDERSTATE_BORDERCOLOR        = 43,
@@ -877,6 +878,7 @@ typedef enum {
   D3DRENDERSTATE_RANGEFOGENABLE     = 48,
   D3DRENDERSTATE_ANISOTROPY         = 49,
   D3DRENDERSTATE_FLUSHBATCH         = 50,
+  /* d3d6 */
   D3DRENDERSTATE_TRANSLUCENTSORTINDEPENDENT = 51,
 
   D3DRENDERSTATE_STENCILENABLE      = 52,
@@ -930,6 +932,7 @@ typedef enum {
   D3DRENDERSTATE_WRAP5              = 133,
   D3DRENDERSTATE_WRAP6              = 134,
   D3DRENDERSTATE_WRAP7              = 135,
+  /* d3d7 */
   D3DRENDERSTATE_CLIPPING            = 136,
   D3DRENDERSTATE_LIGHTING            = 137,
   D3DRENDERSTATE_EXTENTS             = 138,