diff --git a/app.sh b/app.sh
index 0244bb0..37a3130 100644
--- a/app.sh
+++ b/app.sh
@@ -13,7 +13,7 @@ while true ; do
   echo "[INFO] pull repository..."
   git pull --quiet &> /dev/null
 
-  echo "check variables..."
+  echo "[INFO] check variables..."
   if [ -z "$INTERVAL" ] ; then
       echo "[ERROR] \$INTERVAL is not set."
       exit 3