diff --git a/example.gitignore b/example.gitignore
index c292c2e..42c95c4 100644
--- a/example.gitignore
+++ b/example.gitignore
@@ -41,3 +41,7 @@ sites/simpletest
 # Ignore core phpcs.xml and phpunit.xml.
 core/phpcs.xml
 core/phpunit.xml
+
+# Ignore node_modules folder created when installing core's JavaScript
+# dependencies.
+core/node_modules