diff --git a/README.md b/README.md
index bd7f8e6..6121319 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,8 @@ Recreated env_cascade_light from CS GO based on env_projectedtexture and Real CS
 # How to make this work in your Source 2013 mod?
 Copy client and server foldert to your "source code/game" folder, then find client_base/server_base.vpc files in these folders and add "$Include "csm.vpc"" to the top, open createallprojects.bat (or creategameprojects.bat) and add "-f" to the end of the line. After all this stuff you should launch your bat file.
 
+if you can't compile the code then make sure you have lights.h in your project and it has this code:
+
 ```cpp
 class CEnvLight : public CLight
 {