Update tmux.md

Author: nicholaswilde

docs/tmux.md

@@ -8,6 +8,16 @@
     sudo apt install tmux
     ```
 
+## [Allow Notify in tmux][1]
+
+```quote ""
+
+    ```shell
+    set -g allow-passthrough on
+    ```
+
 ## :link: References
 
 - <https://tmuxcheatsheet.com/>
+
+[1]: <https://groups.google.com/a/chromium.org/g/chromium-hterm/c/davGyRBr3l8/m/7BPjaTwQAAAJ>