diff --git a/docs/SETUP_DEVELOPMENT.md b/docs/SETUP_DEVELOPMENT.md
index 4a7f22b241..2611c94a55 100644
--- a/docs/SETUP_DEVELOPMENT.md
+++ b/docs/SETUP_DEVELOPMENT.md
@@ -69,3 +69,4 @@ After making sure all tests pass and the test-coverage is at 100%, please send a
 These specs and tools help enormously when developing new rules.
 * [ESTree Spec](https://github.com/estree/estree/blob/master/spec.md)
 * [Espree Parser](http://eslint.org/parser/)
+* [JS AST Explorer](http://felix-kling.de/esprima_ast_explorer/)