diff --git a/.gitignore b/.gitignore
index c880df05..0dbc3acc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,4 +6,7 @@ node_modules
 .settings/org.eclipse.wst.jsdt.ui.superType.container
 .settings/org.eclipse.wst.jsdt.ui.superType.name
 npm-debug.log
-examples/graph/24_hierarchical_layout_userdefined2.html
\ No newline at end of file
+examples/graph/24_hierarchical_layout_userdefined2.html
+
+# vim temporary files
+.*.sw[op]