diff --git a/Running-from-source.md b/Running-from-source.md
index 667c46b..7e5dfa5 100644
--- a/Running-from-source.md
+++ b/Running-from-source.md
@@ -1,6 +1,9 @@
 Running from source
 ===
 
+You will currently need at least Python 3.7.x to run `stable` code.  In order to run
+`develop` you will need Python 3.8.x or higher (3.9.x has had some testing).
+
 1. You have two choices:
     1. Using a zip of the latest stable source. Download and extract the
      [latest stable source code](https://github.com/EDCD/EDMarketConnector/archive/stable.zip).