diff --git a/wadsrc/static/zscript/constants.zs b/wadsrc/static/zscript/constants.zs
index 23322094c..02e6d4fce 100644
--- a/wadsrc/static/zscript/constants.zs
+++ b/wadsrc/static/zscript/constants.zs
@@ -851,20 +851,26 @@ enum EMaskRotationFlags
 
 enum ERenderStyle
 {
-	STYLE_None,
-	STYLE_Normal,
-	STYLE_Fuzzy,
-	STYLE_SoulTrans,
-	STYLE_OptFuzzy,
-	STYLE_Stencil,
-	STYLE_Translucent,
-	STYLE_Add,
-	STYLE_Shaded,
+	STYLE_None,				// Do not draw
+	STYLE_Normal,			// Normal; just copy the image to the screen
+	STYLE_Fuzzy,			// Draw silhouette using "fuzz" effect
+	STYLE_SoulTrans,		// Draw translucent with amount in r_transsouls
+	STYLE_OptFuzzy,			// Draw as fuzzy or translucent, based on user preference
+	STYLE_Stencil,			// Fill image interior with alphacolor
+	STYLE_Translucent,		// Draw translucent
+	STYLE_Add,				// Draw additive
+	STYLE_Shaded,			// Treat patch data as alpha values for alphacolor
 	STYLE_TranslucentStencil,
 	STYLE_Shadow,
-	STYLE_Subtract,
-	STYLE_AddStencil,
-	STYLE_AddShaded,
+	STYLE_Subtract,			// Actually this is 'reverse subtract' but this is what normal people would expect by 'subtract'.
+	STYLE_AddStencil,		// Fill image interior with alphacolor
+	STYLE_AddShaded,		// Treat patch data as alpha values for alphacolor
+	STYLE_Multiply,			// Multiply source with destination (HW renderer only.)
+	STYLE_InverseMultiply,	// Multiply source with inverse of destination (HW renderer only.)
+	STYLE_ColorBlend,		// Use color intensity as transparency factor
+	STYLE_Source,			// No blending (only used internally)
+	STYLE_ColorAdd,			// Use color intensity as transparency factor and blend additively.
+
 };
 
 // Type definition for the implicit 'callingstate' parameter that gets passed to action functions.