diff --git a/.gitignore b/.gitignore
index 9d850e6e8..b4459c051 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,11 @@
+
+# populated by npm
 node_modules/
+
+# compiled TypeScript code from src/
 /lib/
+
+# local development helpers
 Makefile
+/*.bolt
+/*.c