Update Manual.md
Fix `usrsctp_sysctl_set_sctp_auth_enable()`.
diff --git a/Manual.md b/Manual.md
index f6e767d..e52fad7 100644
--- a/Manual.md
+++ b/Manual.md
@@ -587,8 +587,8 @@
#### usrsctp_sysctl_set_sctp_multiple_asconfs()
By default the sending of multiple ASCONFs is disabled.
-#### usrsctp_sysctl_set_sctp_auth_disable()
-The use of AUTH, which is normally turned on, can be disabled by setting this parameter to 1.
+#### usrsctp_sysctl_set_sctp_auth_enable()
+The use of AUTH, which is normally turned on, can be disabled by setting this parameter to 0.
#### usrsctp_sysctl_set_sctp_asconf_auth_nochk()
It is also possible to disable the requirement to use AUTH in conjunction with ADD-IP by setting this parameter
