diff --git a/HISTORY.md b/HISTORY.md
index 9d7db0e67..5933e0cb7 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -3,6 +3,8 @@
 
 ### main branch
 
+- Added `--subtree-only` to limit aider to current directory subtree.
+  - Should help with large/mono repo performance.
 - New `/add-clipboard-image` to add images to the chat from your clipboard.
 - Support for Sonnet's 8k output window.
   - [Aider already supported infinite output from Sonnet.](https://aider.chat/2024/07/01/sonnet-not-lazy.html)
diff --git a/aider/website/HISTORY.md b/aider/website/HISTORY.md
index cc9e75c7f..7c460c690 100644
--- a/aider/website/HISTORY.md
+++ b/aider/website/HISTORY.md
@@ -18,6 +18,8 @@ cog.out(text)
 
 ### main branch
 
+- Added `--subtree-only` to limit aider to current directory subtree.
+  - Should help with large/mono repo performance.
 - New `/add-clipboard-image` to add images to the chat from your clipboard.
 - Support for Sonnet's 8k output window.
   - [Aider already supported infinite output from Sonnet.](https://aider.chat/2024/07/01/sonnet-not-lazy.html)