diff --git a/PLUGINS.md b/PLUGINS.md
index 2125d117..00d48155 100644
--- a/PLUGINS.md
+++ b/PLUGINS.md
@@ -21,6 +21,13 @@ Plugins are python files. The plugin folder must have a file named `load.py`
 that must provide one module level function and optionally provide a few
 others.
 
+If you're running from source (which allows for debugging with e.g. [PyCharm](https://www.jetbrains.com/pycharm/features/))
+then you'll need to be using an appropriate version of Python.  The current
+version is listed in the [Environment section of Releasing.md](https://github.com/EDCD/EDMarketConnector/blob/main/docs/Releasing.md#environment).
+If you're developing your plugin simply against an install of EDMarketConnector
+then you'll be relying on the bundled version of Python (it's baked 
+into the .exe via the py2exe build process).
+
 ---
 
 ### Examples