diff --git a/api/.env.example b/api/.env.example
index 1ff6b3be8b8959..74f83aa06c8842 100644
--- a/api/.env.example
+++ b/api/.env.example
@@ -433,3 +433,5 @@ RESET_PASSWORD_TOKEN_EXPIRY_MINUTES=5
 
 CREATE_TIDB_SERVICE_JOB_ENABLED=false
 
+# Maximum number of submitted thread count in a ThreadPool for parallel node execution
+MAX_SUBMIT_COUNT=100