diff --git a/main.go b/main.go
index 9a7bf55..208b83c 100644
--- a/main.go
+++ b/main.go
@@ -29,6 +29,18 @@ func main() {
 	me.forge = forgepb.Init()
 	me.found = new(gitpb.Repos)
 
+	all := me.forge.Repos.SortByFullPath()
+	for all.Scan() {
+		repo := all.Next()
+		if repo.IsMasterBranch() {
+			continue
+		}
+		log.Info("not on master branch:", repo.GetCurrentBranchName(), repo.GetMasterBranchName())
+		log.Info("not on master branch:", repo.GetFullPath())
+		log.Info("you can not continue if repos are not on master branches")
+		os.Exit(-1)
+	}
+
 	// me.forge.ConfigPrintTable()
 	os.Setenv("REPO_WORK_PATH", me.forge.GetGoSrc())