diff --git a/prepareRelease.go b/prepareRelease.go
index f748485..bec6add 100644
--- a/prepareRelease.go
+++ b/prepareRelease.go
@@ -222,6 +222,13 @@ func rePrepareRelease() {
 
 	}
 	me.forge.PrintHumanTable(me.found)
+	// todo: verify each found repo is on the master branch
+	for repo := range me.found.IterAll() {
+		if repo.CurrentBranchName != repo.MasterBranchName {
+			log.Info("repo not on master branch", repo.FullPath)
+			os.Exit(-1)
+		}
+	}
 }
 
 func printDone() {