diff --git a/experiment/patch_apk.sh b/experiment/patch_apk.sh
index 6dd5162..98f1fff 100644
--- a/experiment/patch_apk.sh
+++ b/experiment/patch_apk.sh
@@ -51,6 +51,7 @@ split -a 2 -d -l "${N_CHUNK}" "${TMP_DIR}/apk_list" "${TMP_DIR}/apks/"
 
 worker() {
   for sha in $(cat "${TMP_DIR}/apks/${1}"); do
+    echo "worker ${1} started"
     # Check the result folder exist
     if [ ! -d "${RES_DIR}/${sha}" ]; then
       echo "Dynamic result not found for ${sha} (folder ${RES_DIR}/${sha} not found)"