diff --git a/PLUGINS.md b/PLUGINS.md
index dcf4cd1b..3e8159fc 100644
--- a/PLUGINS.md
+++ b/PLUGINS.md
@@ -132,7 +132,7 @@ def plugin_app(parent):
 
 Once you have created your plugin and EDMC has loaded it there are three other functions you can define to be notified by EDMC when something happens: `journal_entry()`, `dashboard_entry()` and `cmdr_data()`.
 
-Your events all get called on the main tkinter loop so be sure not to block for very long or the EDMC will appear to freeze. If you have a long running operation then you should take a look at how to do background updates in tkinter - http://effbot.org/zone/tkinter-threads.htm
+Your events all get called on the main Tkinter loop so be sure not to block for very long or the app will appear to freeze. If you have a long running operation such as sending or receiving data from an external server then you should do this in a separate worker Thread. You can send work items to the worker thread over a Queue. Tkinter is not thread-safe so you should not access any Tkinter resources (including widgets and variables) from worker threads - doing so may cause the app to crash intermittently. You can signal back to the main thread using Tkinter's `event_generate()` widget method, generating a user-defined event that you have previously registered with the [`bind_all()`](http://effbot.org/tkinterbook/tkinter-events-and-bindings.htm) widget method. See the [EDSM plugin](https://github.com/Marginal/EDMarketConnector/blob/master/plugins/edsm.py) for an example of these techniques.
 
 ### Journal Entry