diff --git a/docs/libssh2_channel_request_auth_agent.3 b/docs/libssh2_channel_request_auth_agent.3
index 8f9ab62b..4da47bab 100644
--- a/docs/libssh2_channel_request_auth_agent.3
+++ b/docs/libssh2_channel_request_auth_agent.3
@@ -16,9 +16,18 @@ request over this specific channel, which causes the agent listener to be
 started on the remote side upon success. This agent listener will then run
 for the duration of the SSH session.
 
+To use agent forwarding,
+.BR libssh2_session_callback_set2(3)
+must first be called to set \fBLIBSSH2_CALLBACK_AUTHAGENT\fP.
+This callback will be invoked when the remote host opens a connection to the
+local agent.
+
 \fIchannel\fP - Previously opened channel instance such as returned by
 .BR libssh2_channel_open_ex(3)
 .SH RETURN VALUE
 Return 0 on success or negative on failure. It returns
 LIBSSH2_ERROR_EAGAIN when it would otherwise block. While
 LIBSSH2_ERROR_EAGAIN is a negative number, it is not really a failure per se.
+
+.SH SEE ALSO
+.BR libssh2_session_callback_set2(3)