diff --git a/Developer's-Guide.md b/Developer's-Guide.md
index e52e080..ae1d082 100644
--- a/Developer's-Guide.md
+++ b/Developer's-Guide.md
@@ -63,7 +63,9 @@ If you're using PyCharm, you can configure the project to use your virtualenv in
 
 Set up your virtual env (described above), activate your env, then:
 
+```
 PYTHONPATH=. python ./qt_ui/main.py
+```
 
 ### OS X terminal