diff --git a/events/client.go b/events/client.go
index 81dfdf1..d5852e7 100644
--- a/events/client.go
+++ b/events/client.go
@@ -4,7 +4,7 @@
 	"bytes"
 	"encoding/json"
 	// "errors"
-	// "fmt"
+	"fmt"
 	"io/ioutil"
 	"net/http"
 
@@ -34,6 +34,19 @@
   }
 }`
 
+var markEventDoneTmpl = `mutation {
+  updateImageEvent(input: {
+    filter: {
+      id: ["%s"]
+    },
+    set: {
+      state: DONE
+    }
+  }) {
+    numUids
+  }
+}`
+
 // Implements EventStore
 type GraphQLClient struct {
 	apiAddr string
@@ -101,3 +114,17 @@
 	}
 	return events, nil
 }
+
+func (c *GraphQLClient) MarkEventDone(event Event) error {
+	q := query{fmt.Sprintf(markEventDoneTmpl, event.Id)}
+	qJson, err := json.Marshal(q)
+	if err != nil {
+		return err
+	}
+	_, err = http.Post(c.apiAddr, jsonContentType, bytes.NewReader(qJson))
+	if err != nil {
+		return err
+	}
+	// TODO(giolekva): check errors field
+	return nil
+}