diff --git a/plugins/analysis/diff_extractor.rb b/plugins/analysis/diff_extractor.rb
index bf22fb2..595e885 100644
--- a/plugins/analysis/diff_extractor.rb
+++ b/plugins/analysis/diff_extractor.rb
@@ -21,7 +21,7 @@
 class DiffExtractor < Diggit::Analysis
 	require_addons 'out'
 
-	ALLOWED_EXTENSIONS = ['.java', '.rb'].freeze
+	ALLOWED_EXTENSIONS = ['.java', '.rb', '.js'].freeze
 
 	def initialize(options)
 		super(options)