diff --git a/README.md b/README.md
index 0cfa38fc3ec590409973f06dd8ef688fbf540786..0d1ad78a7abac2492f34a7a72089af3e8a5a492d 100644
--- a/README.md
+++ b/README.md
@@ -66,6 +66,7 @@ Supported keywords
 - **patternProperties** — RegExp-based object properties.
 - **additionalProperties** — Partially supported (?)
 - **dependencies** — Not supported yet (?)
+- **not** — Not supported yet (?)
 
 Using references
 ----------------