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diff --git a/INSTALL b/INSTALL
index de60feb8..bbff1f23 100644
--- a/INSTALL
+++ b/INSTALL
@@ -12,11 +12,22 @@
 I. Upgrade Information
 ~~~~~~~~~~~~~~~~~~~~~~
 
+Differences to version 20.x
+
+- Starting with ngIRCd 21, the ciphers used by SSL are configurable and
+  default to HIGH:!aNULL:@STRENGTH (OpenSSL) or SECURE128 (GnuTLS).
+  Previous version were using the OpenSSL or GnuTLS defaults, DEFAULT
+  and NORMAL respectively.
+
+- When adding GLINE's or KLINE's to ngIRCd 21 (or newer), all clients matching
+  the new mask will be KILL'ed. This was not the case with earlier versions
+  that only added the mask but didn't kill already connected users.
+
 Differences to version 19.x
 
 - Starting with ngIRCd 20, users can "cloak" their hostname only when the
   configuration variable "CloakHostModeX" (introduced in 19.2) is set.
-  Otherwise, only IRC opertators, other servers, and services are allowed to
+  Otherwise, only IRC operators, other servers, and services are allowed to
   set mode +x. This prevents regular users from changing their hostmask to
   the name of the IRC server itself, which confused quite a few people ;-)