diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8cfa731d9..6eb2b4617 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -479,7 +479,7 @@ OPTION(OSG_PROVIDE_READFILE "Set to ON for include/osgDB/ReadFile to provide the
 OPTION(OSG_USE_REF_PTR_IMPLICIT_OUTPUT_CONVERSION "Set to ON to use the ref_ptr<> T* operator() output conversion. " ON)
 OPTION(OSG_USE_REF_PTR_SAFE_DEREFERENCE "Set to ON to throw an exception whenever ref_ptr<> is dereferenced or called. " OFF)
 
-OPTION(OSG_ENVVAR_SUPPORTED "Set to ON to build OpenSceneGraph with the OSG_ENVVAR_SUPPOERTED #define enabled to enable use of getenv() related functions." ON)
+OPTION(OSG_ENVVAR_SUPPORTED "Set to ON to build OpenSceneGraph with the #define OSG_ENVVAR_SUPPORTED, found in include/osg/Config, to enable use of getenv() related functions." ON)