diff --git a/keys/contributors/hans b/keys/contributors/hans
new file mode 100644
index 00000000..79c5376d
--- /dev/null
+++ b/keys/contributors/hans
@@ -0,0 +1 @@
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKySVqJG9mlkSTBUFDWQ+jcG5AK13CSd1ISnbuT5eI6d hans@procolix.com
diff --git a/matrix/README.md b/matrix/README.md
index 8b5dd22f..e0ba681f 100644
--- a/matrix/README.md
+++ b/matrix/README.md
@@ -13,6 +13,11 @@ The main focus will be on the server itself, Synapse, but there's a lot more
 than just that.
 
 
+This documentation isn't ready yet, and if you find errors or room for improvement,
+please let me know. You can do that via Matrix, obviously (`@hans:woefdram.nl`), via
+e-mail (`docs@fediversity.eu`), or make a Pull Request.
+
+
 ## Overview
 
 A complete Matrix environment consists of many parts. Other than the Matrix