Update README.md

README.md

@@ -64,6 +64,9 @@ If you'd like to contribute, please get in touch with me or create a pull reques
 ### Unsupported Modules
 - Obsidian (no plans to support at this time)
 
+### Known Issues
+- Roll dialog does not show up if you're using Downtime Tracker along with the Use Average Rolls setting of Group Roll Checks and Saves. This issue has been reports here, and this page will be updated when it gets fixed: https://github.com/trdischat/grouproll/issues/10
+
 ## Got Questions? Find a Bug?
 Contact me on Discord (CRASH1115#2944) to chat, or create an issue right here on GitHub.