diff --git a/application/src/main/resources/thingsboard.yml b/application/src/main/resources/thingsboard.yml
index a94ecc8de0..b73c4f1fda 100644
--- a/application/src/main/resources/thingsboard.yml
+++ b/application/src/main/resources/thingsboard.yml
@@ -1554,6 +1554,7 @@ queue:
       enabled: "${TB_QUEUE_RULE_ENGINE_STATS_ENABLED:true}"
       # Statistics printing interval for Rule Engine
       print-interval-ms: "${TB_QUEUE_RULE_ENGINE_STATS_PRINT_INTERVAL_MS:60000}"
+      # Max length of error message that is printed by statistics
       max-error-message-length: "${TB_QUEUE_RULE_ENGINE_MAX_ERROR_MESSAGE_LENGTH:4096}"
     queues:
       - name: "${TB_QUEUE_RE_MAIN_QUEUE_NAME:Main}" # queue name