diff --git a/.gitignore b/.gitignore
index be10dca..da100c9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,10 +1,16 @@
+# lock file
+!yarn.lock
+
+# Generated files
+/lib
+
 # Dependency directory
 node_modules
 jspm_packages
 
 # Coverage directory used by nyc
-coverage
-.nyc_output
+/coverage
+/.nyc_output
 
 # Documentation
-gh-pages
+/gh-pages