diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 3dcb26cd33f6c4d2e00a3af9b3fac12933616943..1a6de5b522736f54f8d74f1013dc69024dd857c4 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -1455,10 +1455,17 @@ sctp_mem - vector of 3 INTEGERs: min, pressure, max
 	Default is calculated at boot time from amount of available memory.
 
 sctp_rmem - vector of 3 INTEGERs: min, default, max
-	See tcp_rmem for a description.
+	Only the first value ("min") is used, "default" and "max" are
+	ignored.
+
+	min: Minimal size of receive buffer used by SCTP socket.
+	It is guaranteed to each SCTP socket (but not association) even
+	under moderate memory pressure.
+
+	Default: 1 page
 
 sctp_wmem  - vector of 3 INTEGERs: min, default, max
-	See tcp_wmem for a description.
+	Currently this tunable has no effect.
 
 addr_scope_policy - INTEGER
 	Control IPv4 address scoping - draft-stewart-tsvwg-sctp-ipv4-00