diff --git a/README.md b/README.md
index 8610e17..e4b4fd3 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,11 @@ What license is it under?
 
 LGPLv3 or later. See `COPYING` and `COPYING.LESSER`.
 
+Notes
+-----
+
+This library does not yet implement RFC7622.
+
 License yadda yadda.
 --------------------