diff --git a/Build-OSX.md b/Build-OSX.md
index 932c2f9..6b9a000 100644
--- a/Build-OSX.md
+++ b/Build-OSX.md
@@ -60,6 +60,8 @@ build$ SoapySDRUtil --info
 ```
 
 ### Build CubicSDR
+_Note: add ``` -DUSE_HAMLIB=1 ``` to cmake command line to include hamlib support._
+
 ```
 ccliffe$ git clone https://github.com/cjcliffe/CubicSDR.git
 .. cloning ..