diff --git a/configs/core.cfg.sample b/configs/core.cfg.sample
index 23b1f9fe..5418def0 100644
--- a/configs/core.cfg.sample
+++ b/configs/core.cfg.sample
@@ -287,5 +287,5 @@ TEXT_MAX_SIZE = 1000000
 # 1 Gb Max file size for file submission
 FILE_MAX_SIZE = 1000000000
 # Managed file extenions for file submission, comma separated
-# TODO add 'zip', 'gz' and 'tar.gz'
-FILE_ALLOWED_EXTENSIONS = 'txt','sh','pdf'
+# TODO add zip, gz and tar.gz
+FILE_ALLOWED_EXTENSIONS = txt,sh,pdf