diff --git a/Build-OSX---MacPorts-.App.md b/Build-OSX---MacPorts-.App.md
index 0ffe282..355d81e 100644
--- a/Build-OSX---MacPorts-.App.md
+++ b/Build-OSX---MacPorts-.App.md
@@ -1,5 +1,7 @@
 # Mac App Build Instructions (using MacPorts):
 
+Note: Currently requires branch osx-app-build https://github.com/cjcliffe/CubicSDR/tree/osx-app-build
+
 ### Build wxWidgets
 
 Substitute your own user paths where appropriate.