diff --git a/readme.rst b/readme.rst
index 9ba9766d..96f72806 100644
--- a/readme.rst
+++ b/readme.rst
@@ -109,6 +109,10 @@ This will do several things:
 The ``run`` target is therefore very convenient when preparing to submit a
 change to the documentation.
 
+.. note:: 
+
+   If you encounter the error ``locale.Error: unsupported locale setting`` when activating the Python virtual environment, include the environment variable in the command and try again: ``LC_ALL=en_US.UTF-8 make run``.
+
 Local checks
 ~~~~~~~~~~~~