diff --git a/Dangerfile b/Dangerfile
index 770c8bb..f3b0151 100644
--- a/Dangerfile
+++ b/Dangerfile
@@ -1 +1,7 @@
-message("Hello, this worked")
+if github.pr_body.length < 5
+  fail "Please provide a summary in the Pull Request description"
+end
+
+if github.pr_json["milestone"] > 1
+  fail "Please provide only one extension per PR"
+end