diff --git a/mac/cmake_build.txt b/mac/cmake_build.txt
index f3198873d..a244cb131 100644
--- a/mac/cmake_build.txt
+++ b/mac/cmake_build.txt
@@ -46,10 +46,13 @@ release. Still, read this document throughly before starting.
 
       /usr/local/x86_64/bin/wx-config --version
 
-6) Now that you have wxWidgets installed, edit your .bash_profile and add:
+6) Now that you have wxWidgets installed, edit your ~/.bash_profile or
+   ~/.zprofile and add:
 
       export WX_CONFIG=/usr/local/x86_64/bin/wx-config
 
+   Log out and back in again (or reboot) for this to take effect.
+
 7) Download the CMake 3.16.4 DMG from:
 
       https://cmake.org/download