diff --git a/README.md b/README.md
index 6d2c57c..164d096 100644
--- a/README.md
+++ b/README.md
@@ -202,6 +202,7 @@ The `th2_check1_active_tasks_number` metric separate rules with label `rule_type
 #### Changed:
 + Migrated `sailfish-utils` version from `3.12.2` to `3.12.3`
   + Improved condition output format for `EQ_PRECISION`, `WILDCARD`, `LIKE`, `IN`, `MORE`, `LESS` operations and their negative versions
++ Changed the way the check1 works with threads internally. Now it uses a common executor for running check rules instead of create an executor per each rule
 
 ### 3.9.0