diff --git a/doc/spec/control-spec.txt b/doc/spec/control-spec.txt
index 883c78f407..86bdf84052 100644
--- a/doc/spec/control-spec.txt
+++ b/doc/spec/control-spec.txt
@@ -1556,7 +1556,13 @@ $Id$
 4.1.12. Network status has changed
 
   Syntax:
-     "650" "+" "NS" CRLF  1*NetworkStatus "." CRLF "650" SP "OK" CRLF
+     "650" "+" "NS" CRLF 1*NetworkStatus "." CRLF "650" SP "OK" CRLF
+
+  The event is used whenever our local view of a relay status changes.
+  This happens when we get a new v3 consensus (in which case the entries
+  we see are a duplicate of what we see in the NEWCONSENSUS event,
+  below), but it also happens when we decide to mark a relay as up or
+  down in our local status, for example based on connection attempts.
 
   [First added in 0.1.2.3-alpha]
 
@@ -1596,6 +1602,20 @@ $Id$
   set of "countrycode=count" pairs. For example,
   650-CLIENTS_SEEN TimeStarted="Thu Dec 25 23:50:43 EST 2008"
   650 CountrySummary=us=16,de=8,uk=8
+[XXX Matt Edman informs me that the time format above is wrong. -RD]
+
+4.1.15. New consensus networkstatus has arrived.
+
+  The syntax is:
+     "650" "+" "NEWCONSENSUS" CRLF 1*NetworkStatus "." CRLF "650" SP
+     "OK" CRLF
+
+  A new consensus networkstatus has arrived. We include NS-style lines for
+  every relay in the consensus. NEWCONSENSUS is a separate event from the
+  NS event, because the list here represents every usable relay: so any
+  relay *not* mentioned in this list is implicitly no longer recommended.
+
+  [First added in 0.2.1.13-alpha]
 
 5. Implementation notes
 
diff --git a/src/or/control.c b/src/or/control.c
index f435251751..222a6e0762 100644
--- a/src/or/control.c
+++ b/src/or/control.c
@@ -42,7 +42,8 @@
 #define EVENT_GUARD            0x0013
 #define EVENT_STREAM_BANDWIDTH_USED   0x0014
 #define EVENT_CLIENTS_SEEN     0x0015
-#define _EVENT_MAX             0x0015
+#define EVENT_NEWCONSENSUS     0x0016
+#define _EVENT_MAX             0x0016
 /* If _EVENT_MAX ever hits 0x0020, we need to make the mask wider. */
 
 /** Bitfield: The bit 1&lt;&lt;e is set if <b>any</b> open control
@@ -999,6 +1000,8 @@ handle_control_setevents(control_connection_t *conn, uint32_t len,
         event_code = EVENT_STREAM_BANDWIDTH_USED;
       else if (!strcasecmp(ev, "CLIENTS_SEEN"))
         event_code = EVENT_CLIENTS_SEEN;
+      else if (!strcasecmp(ev, "NEWCONSENSUS"))
+        event_code = EVENT_NEWCONSENSUS;
       else {
         connection_printf_to_buf(conn, "552 Unrecognized event \"%s\"\r\n",
                                  ev);
@@ -3516,16 +3519,20 @@ control_event_or_authdir_new_descriptor(const char *action,
 
 /** Called when the routerstatus_ts <b>statuses</b> have changed: sends
  * an NS event to any controller that cares. */
-int
-control_event_networkstatus_changed(smartlist_t *statuses)
+static int
+control_event_networkstatus_changed_helper(smartlist_t *statuses,
+                                           uint16_t event,
+                                           const char *event_string)
 {
   smartlist_t *strs;
   char *s, *esc = NULL;
-  if (!EVENT_IS_INTERESTING(EVENT_NS) || !smartlist_len(statuses))
+  if (!EVENT_IS_INTERESTING(event) || !smartlist_len(statuses))
     return 0;
 
   strs = smartlist_create();
-  smartlist_add(strs, tor_strdup("650+NS\r\n"));
+  smartlist_add(strs, tor_strdup("650+"));
+  smartlist_add(strs, tor_strdup(event_string));
+  smartlist_add(strs, tor_strdup("\r\n"));
   SMARTLIST_FOREACH(statuses, routerstatus_t *, rs,
     {
       s = networkstatus_getinfo_helper_single(rs);
@@ -3538,14 +3545,27 @@ control_event_networkstatus_changed(smartlist_t *statuses)
   SMARTLIST_FOREACH(strs, char *, cp, tor_free(cp));
   smartlist_free(strs);
   tor_free(s);
-  send_control_event_string(EVENT_NS, ALL_NAMES|ALL_FORMATS, esc);
-  send_control_event_string(EVENT_NS, ALL_NAMES|ALL_FORMATS,
+  send_control_event_string(event, ALL_NAMES|ALL_FORMATS, esc);
+  send_control_event_string(event, ALL_NAMES|ALL_FORMATS,
                             "650 OK\r\n");
 
   tor_free(esc);
   return 0;
 }
 
+int
+control_event_networkstatus_changed(smartlist_t *statuses)
+{
+  return control_event_networkstatus_changed_helper(statuses, EVENT_NS, "NS");
+}
+
+int
+control_event_newconsensus(const networkstatus_t *consensus)
+{
+  return control_event_networkstatus_changed_helper(
+           consensus->routerstatus_list, EVENT_NEWCONSENSUS, "NEWCONSENSUS");
+}
+
 /** Called when a single local_routerstatus_t has changed: Sends an NS event
  * to any countroller that cares. */
 int
diff --git a/src/or/networkstatus.c b/src/or/networkstatus.c
index 306ecb4278..81b1d07115 100644
--- a/src/or/networkstatus.c
+++ b/src/or/networkstatus.c
@@ -1317,6 +1317,9 @@ notify_control_networkstatus_changed(const networkstatus_t *old_c,
   smartlist_t *changed;
   if (old_c == new_c)
     return;
+
+  control_event_newconsensus(new_c);
+
   if (!old_c) {
     control_event_networkstatus_changed(new_c->routerstatus_list);
     return;
diff --git a/src/or/or.h b/src/or/or.h
index d8122dbbc3..7c191eeaf3 100644
--- a/src/or/or.h
+++ b/src/or/or.h
@@ -3236,6 +3236,7 @@ int control_event_or_authdir_new_descriptor(const char *action,
                                             const char *msg);
 int control_event_my_descriptor_changed(void);
 int control_event_networkstatus_changed(smartlist_t *statuses);
+int control_event_newconsensus(const networkstatus_t *consensus);
 int control_event_networkstatus_changed_single(routerstatus_t *rs);
 int control_event_general_status(int severity, const char *format, ...)
   CHECK_PRINTF(2,3);