diff --git a/doc/snmp_agent.txt b/doc/snmp_agent.txt
index 2653230f..3d514cc3 100644
--- a/doc/snmp_agent.txt
+++ b/doc/snmp_agent.txt
@@ -91,22 +91,6 @@ one or more trap destinations using these calls:
 snmp_trap_dst_enable();
 snmp_trap_dst_ip_set();
 
-In the lwIP initialisation sequence call snmp_init() just after
-the call to udp_init().
-
-Exactly every 10 msec the SNMP uptime timestamp must be updated with
-snmp_inc_sysuptime(). You should call this from a timer interrupt
-or a timer signal handler depending on your runtime environment.
-
-An alternative way to update the SNMP uptime timestamp is to do a call like
-snmp_add_sysuptime(100) each 1000ms (which is bigger "step", but call to
-a lower frequency). Another one is to not call snmp_inc_sysuptime() or
-snmp_add_sysuptime(), and to define the SNMP_GET_SYSUPTIME(sysuptime) macro.
-This one is undefined by default in mib2.c. SNMP_GET_SYSUPTIME is called inside
-snmp_get_sysuptime(u32_t *value), and enable to change "sysuptime" value only
-when it's queried (any function which need "sysuptime" have to call
-snmp_get_sysuptime).
-
 
 3 Private MIBs
 ==============