diff --git a/lib/linguist/vendor.yml b/lib/linguist/vendor.yml
index 0bf4bb6c..a1efbdfa 100644
--- a/lib/linguist/vendor.yml
+++ b/lib/linguist/vendor.yml
@@ -110,6 +110,9 @@
 # MathJax
 - (^|/)MathJax/
 
+# Codemirror
+- (^|/)[Cc]ode[Mm]irror/(lib|mode|theme|addon|keymap)
+
 # SyntaxHighlighter - http://alexgorbatchev.com/
 - (^|/)shBrush([^.]*)\.js$
 - (^|/)shCore\.js$