diff --git a/docs/modding/util/vrad.md b/docs/modding/util/vrad.md
index 06fda000..1393253e 100644
--- a/docs/modding/util/vrad.md
+++ b/docs/modding/util/vrad.md
@@ -122,7 +122,7 @@ Other options:
   -OnlyStaticProps   : Only perform direct static prop lighting (vrad debug option)
   -StaticPropNormals : when lighting static props, just show their normal vector
   -StaticPropBounce  : Enable static props to bounce light. Experimental option, doesn't work with VMPI right now.
-  -textureshadows : Allows models to cast shadows based on the alpha channel of their texture. Does not work with brushes, and in the case of skins, will use the first one.
+  -textureshadows : Allows models to cast shadows based on the alpha channel of their texture. Only works with brushes that have the flag CONTENTS_GRATE (such as by using %CompilePassBullets in the VMT), and in the case of skins, will use the first one.
   -noskyboxrecurse : Turn off recursion into 3d skybox (skybox shadows on world)
   -nossprops      : Globally disable self-shadowing on static props