diff --git a/libs/langchain/langchain/schema/runnable/base.py b/libs/langchain/langchain/schema/runnable/base.py
index 3f6148e9494..a4c95c12eed 100644
--- a/libs/langchain/langchain/schema/runnable/base.py
+++ b/libs/langchain/langchain/schema/runnable/base.py
@@ -1444,6 +1444,8 @@ class RunnableLambda(Runnable[Input, Output]):
         if hasattr(self, "afunc"):
             return await self._acall_with_config(self._ainvoke, input, config)
         else:
+            # Delegating to super implementation of ainvoke.
+            # Uses asyncio executor to run the sync version (invoke) 
             return await super().ainvoke(input, config)