diff --git a/Keywords.md b/Keywords.md
index e40e4bd..86e0260 100644
--- a/Keywords.md
+++ b/Keywords.md
@@ -1,3 +1,5 @@
+# Use lowercase for `true`, `false` and `null`
+
 `true`, `false` and `null` must be written in lower case letters.
 
 <details><summary>Example</summary><div><br>