diff --git a/icingabot.py b/icingabot.py
index 7b33307..8a09503 100755
--- a/icingabot.py
+++ b/icingabot.py
@@ -108,7 +108,7 @@ class Icinga2ServiceManager:
             "X-HTTP-Method-Override": "GET",
         }
         data = {
-            "attrs": ["last_check_result", "display_name", "host_name"],
+            "attrs": ["last_check_result", "display_name", "host_name", "acknowledgement"],
             "filter": "service.state!=ServiceOK",
         }
         try:
@@ -310,6 +310,9 @@ class IcingaBot(Icinga2ServiceManager, irc.bot.SingleServerIRCBot):
     def do_leave(self, c, e):
         self.disconnect()
 
+    def get_unack_ko_services(self):
+        return [s for s in self.ko_services if not s["attrs"]["acknowledgement"]]
+
     def regrouped_ko_services(self):
         def regroup_key(elem):
             return elem["attrs"]["display_name"]
@@ -317,7 +320,7 @@ class IcingaBot(Icinga2ServiceManager, irc.bot.SingleServerIRCBot):
         return [
             (group, [service["attrs"]["host_name"] for service in services])
             for group, services in groupby(
-                sorted(self.ko_services, key=regroup_key), regroup_key
+                sorted(self.get_unack_ko_services(), key=regroup_key), regroup_key
             )
         ]
 
@@ -339,6 +342,14 @@ class IcingaBot(Icinga2ServiceManager, irc.bot.SingleServerIRCBot):
                     ]
                 )
             )
+            acknowledged = [s for s in self.ko_services if s["attrs"]["acknowledgement"]]
+            if acknowledged:
+                self.send(
+                    "Acknowledged ({}): {}".format(
+                        len(acknowledged),
+                        ', '.join([s["attrs"]["display_name"] for s in acknowledged])
+                    )
+                )
         else:
             self.send("Nothing particularly exciting.")