diff --git a/PROJECT_PLAN.md b/PROJECT_PLAN.md
index a6e96c1..4823bc9 100644
--- a/PROJECT_PLAN.md
+++ b/PROJECT_PLAN.md
@@ -521,6 +521,12 @@ class IPCClient:
 
 ---
 
+## Notes and more cross-app integrations
+
+I like the `tdo` (https://github.com/2KAbhishek/tdo) program for managing markdown notes with fzf and my terminal text editor. It makes it easy to have a "today" note and a list of todos. Perhaps we can gather those todos from the text files in the $NOTES_DIR and put them into the task list during regular sync - and when users mark a task complete the sync can find the text file it was in and mark it complete on that line of markdown text. We need a little ore features for the related annotations then, because when I press `n` in the notes app we would want to actually open the textfile that task came from, not just make another annotation. So we would need a special cross-linking format for knowing which tasks came from a $NOTES_DIR sync. And then we can work on the same IPC scenario for tasks that were created in the email app. Then those tasks should be connected so that when the user views the notes on those tasks they see the whole email. That would be simpe enough if we just copied the email text into an annotation. But maybe we need a way to actually change the selected message ID in the mail app if it's open. So if the user activates the "open" feature on a task the related email will be displayed in the other terminal window where the user has mail open.
+
+---
+
 ## Polish for release and Auth
 
 - Authentication isn't working if the user is in a different directory than expected. Store the auth token in a ~/.local directory so it's consistently availabe in every dir.