diff --git a/launchers/macosx/README.md b/launchers/macosx/README.md
index 24e516876600c3f4f686c2b391f175d1bbb29413..92713a51bb2320dfb6aeb5b9f66f8ab9826082bd 100644
--- a/launchers/macosx/README.md
+++ b/launchers/macosx/README.md
@@ -40,8 +40,9 @@ Homebrew is quite well maintained on OSX and any updates at Oracle should quickl
 You can both build the project from the Xcode UI or you can build it from command line.
 
 An example build command:
-`xcodebuild -target I2PLauncher -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk`
+`REPACK_I2P=1 xcodebuild -target I2PLauncher -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk`
 
+**Note** you don't need REPACK_I2P except for the first build, and each time you wish to repack the zip file containing i2p.
 
 ## Objective-C / Swift Links