diff --git a/util.sh b/util.sh
index 3fee86a..1e55b0c 100755
--- a/util.sh
+++ b/util.sh
@@ -406,4 +406,4 @@ diagnostics() {
 }
 
 command_exists() { command -v "$@" > /dev/null 2>&1; }
-# join_by() { local IFS="$1"; shift; echo "$*"; }
+join_by() { local IFS="$1"; shift; echo "$*"; }