diff --git a/docs/concepts.rst b/docs/concepts.rst
index f7e1aceece5fa..c7ece7f8b4dac 100644
--- a/docs/concepts.rst
+++ b/docs/concepts.rst
@@ -554,6 +554,9 @@ reached, runnable tasks get queued and their state will show as such in the
 UI. As slots free up, queued tasks start running based on the
 ``priority_weight`` (of the task and its descendants).
 
+``Pools are not thread-safe , in case of more than one scheduler in localExecutor Mode
+you can't ensure the non-scheduling of task even if the pool is full.``
+
 Note that if tasks are not given a pool, they are assigned to a default
 pool ``default_pool``.  ``default_pool`` is initialized with 128 slots and
 can changed through the UI or CLI (though it cannot be removed).