diff --git a/dx2cg/README.md b/dx2cg/README.md
index fb02690..faf528d 100644
--- a/dx2cg/README.md
+++ b/dx2cg/README.md
@@ -8,3 +8,4 @@ Tools for converting d3d9 shader assembly to HLSL/Cg.
 - Only vertex shaders with profile `vs_1_1` are supported
 - Only fragment shaders with profile `ps_2_0` are supported
 - Only a limited set of instructions (those used by FF and Unity 2.6) are supported
+- Properties that don't begin with an underscore do not get captured as locals