diff --git a/.hgignore b/.hgignore
--- a/.hgignore
+++ b/.hgignore
@@ -2,5 +2,6 @@
 
 .git
 .DS_Store
+.idea/
 PDFViewer.xcodeproj/xcuserdata/
 PDFViewer.xcodeproj/project.xcworkspace/xcuserdata/