diff --git a/.gitignore b/.gitignore
index fe0513dee2..20f75d9f03 100644
--- a/.gitignore
+++ b/.gitignore
@@ -44,3 +44,7 @@ cypress/downloads
 
 # Fleet local development DB backups
 backup.sql.gz
+
+# Common mistake for new developers to run npm install and then end up
+# committing a package-lock.json. Fleet app uses Yarn with yarn.lock.
+package-lock.json