diff --git a/non-ietf.md b/non-ietf.md
index 7776edf..9f93fe2 100644
--- a/non-ietf.md
+++ b/non-ietf.md
@@ -8,8 +8,14 @@ Note: this page is part of the
 
 # Non-IETF DNS standards
 
- * RPZ
- * RRL
+ * RPZ:
+   Respone Policy Zone is a framework for blocking, dropping queries or  
+   spoofing responses based on domain names, response IP addresses or  
+   nameservers used during resolution. It has long lived as an [ISC Technical
+   Note](https://ftp.isc.org/isc/dnsrpz/isc-tn-2010-1.txt), and failed to become an IETF standard. It is nevertheless very
+   useful, and there is an industry of RPZ providers. Policies are described
+   by zones and are typically transmitted over IXFR.
+ * RRL: Response Rate Limiting
  * DNSCrypt
  * Curvedns
 
diff --git a/tdns/ext/simplesocket b/tdns/ext/simplesocket
index 9829ce7..dbadaf0 160000
--- a/tdns/ext/simplesocket
+++ b/tdns/ext/simplesocket
@@ -1 +1 @@
-Subproject commit 9829ce7772b52442669ba22762c49b4e69397988
+Subproject commit dbadaf003470898fc1471c1621ef3c9e824969d6