diff --git a/cmd/monfront/main.go b/cmd/monfront/main.go
index e600a9e..6f7c3dc 100644
--- a/cmd/monfront/main.go
+++ b/cmd/monfront/main.go
@@ -10,6 +10,7 @@ import (
 	"io/ioutil"
 	"log"
 	"net/http"
+	"os"
 	"strings"
 	"time"
 
@@ -179,6 +180,25 @@ func checkAction(w http.ResponseWriter, r *http.Request) {
 	case "ack":
 		setClause = "acknowledged = true"
 		setTable = "active_checks"
+
+		hostname, err := os.Hostname()
+		if err != nil {
+			log.Printf("could not resolve hostname: %s", err)
+			con.Error = "could not resolve hostname"
+			returnError(http.StatusInternalServerError, con, w)
+			return
+		}
+		if _, err := DB.Exec(`insert into notifications(check_id, states, output, mapping_id, notifier_id, check_host)
+			select ac.check_id, 0 || states[1:array_length(states, 1)], 'check acknowledged', ac.mapping_id,
+			cn.notifier_id, $2
+			from checks_notify cn
+			join active_checks ac on cn.check_id = ac.check_id
+			where cn.check_id = any ($1::int[])`, pq.Array(&checks), &hostname); err != nil {
+			log.Printf("could not acknowledge check: %s", err)
+			con.Error = "could not acknowledge check"
+			returnError(http.StatusInternalServerError, con, w)
+			return
+		}
 	case "comment":
 		if len(r.PostForm["comment"]) == 0 {
 			w.WriteHeader(http.StatusBadRequest)