diff --git a/Running-from-source.md b/Running-from-source.md
index 0cdc1c8..16a6506 100644
--- a/Running-from-source.md
+++ b/Running-from-source.md
@@ -22,6 +22,9 @@ the next release.
     * Note that on Debian (at least up to and including 10.x aka 'Buster') you'll `pip3 install -r requirements.txt` .
     * If you get 'command not found' or similar for the 'pip' command then try: `python -m pip install -r requirements.txt` .
 
+1. Ensure you have tkinter installed if required (such as on Linux)
+    * On Debian / *buntu / *buntu derivatives the package you want is `python3-tk`
+
 1. Run this application:
 
     * Linux: `./EDMarketConnector.py` .