diff --git a/docs/package_developer.md b/docs/package_developer.md
index 0700132..68ba7d7 100644
--- a/docs/package_developer.md
+++ b/docs/package_developer.md
@@ -34,7 +34,7 @@
 `sublime_plugin.WindowCommand` and `sublime_plugin.TextCommand` classes.
 
 The `golangconfig` package interacts with Sublime Text's settings API, which
-means that all calls must occur within the UI thread for compatiblity with
+means that all calls must occur within the UI thread for compatibility with
 Sublime Text 2.
 
 ### setting_value()