diff --git a/README.md b/README.md
index 376b9d6..577e761 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ Usage
 
 1. Download and extract https://github.com/dcarp/cmaked2/archive/master.zip to a local directory \<cmaked2-path\>
 2. Create a D CMake Project: project(project-name D)
-3. Run cmake as usual specifing the cmaked2 path:<br/>
+3. Run cmake as usual specifing the cmaked2 path. To cache it, don't forget to specify the variable type (:PATH).<br/>
 ```
-cmake -DCMAKE_MODULE_PATH=<cmaked2-path> <path-to-source>
+cmake -DCMAKE_MODULE_PATH:PATH=<cmaked2-path> <path-to-source>
 ```