diff --git a/group.go b/group.go
index a954190..a45bce9 100644
--- a/group.go
+++ b/group.go
@@ -64,7 +64,9 @@ type connectionFailedAction struct {
 
 type permissionsChangedAction struct{}
 
-type kickAction struct{}
+type kickAction struct{
+	message string
+}
 
 var groups struct {
 	mu     sync.Mutex
diff --git a/static/protocol.js b/static/protocol.js
index 46bec13..27af3b8 100644
--- a/static/protocol.js
+++ b/static/protocol.js
@@ -437,12 +437,14 @@ ServerConnection.prototype.groupAction = function(kind) {
  *
  * @param {string} kind - One of "op", "unop", "kick", "present", "unpresent".
  * @param {string} id
+ * @param {string} [message]
  */
-ServerConnection.prototype.userAction = function(kind, id) {
+ServerConnection.prototype.userAction = function(kind, id, message) {
     this.send({
         type: 'useraction',
         kind: kind,
         id: id,
+        value: message,
     });
 }
 
diff --git a/static/sfu.js b/static/sfu.js
index d99e6aa..75d627d 100644
--- a/static/sfu.js
+++ b/static/sfu.js
@@ -955,14 +955,14 @@ function handleInput() {
             message = data.substring(1);
             me = false;
         } else {
-            let space, cmd, rest;
-            space = data.indexOf(' ');
+            let cmd, rest;
+            let space = data.indexOf(' ');
             if(space < 0) {
                 cmd = data;
                 rest = '';
             } else {
                 cmd = data.slice(0, space);
-                rest = data.slice(space + 1).trim();
+                rest = data.slice(space + 1);
             }
 
             switch(cmd) {
@@ -1005,22 +1005,31 @@ function handleInput() {
                     displayError("You're not an operator");
                     return;
                 }
+                let username, message;
+                let space = rest.indexOf(' ');
+                if(space < 0) {
+                    username = rest;
+                    message = null;
+                } else {
+                    username = rest.slice(0, space);
+                    message = rest.slice(space + 1).trim();
+                }
                 let id;
-                if(rest in users) {
+                if(username in users) {
                     id = rest;
                 } else {
                     for(let i in users) {
-                        if(users[i] === rest) {
+                        if(users[i] === username) {
                             id = i;
                             break;
                         }
                     }
                 }
                 if(!id) {
-                    displayError('Unknown user ' + rest);
+                    displayError('Unknown user ' + username);
                     return;
                 }
-                serverConnection.userAction(cmd.slice(1), id)
+                serverConnection.userAction(cmd.slice(1), id, message);
                 return;
             }
             default:
diff --git a/webclient.go b/webclient.go
index 8af2019..4a5beaa 100644
--- a/webclient.go
+++ b/webclient.go
@@ -870,7 +870,7 @@ func clientLoop(c *webClient, conn *websocket.Conn) error {
 					}
 				}
 			case kickAction:
-				return userError("you have been kicked")
+				return userError(a.message)
 			default:
 				log.Printf("unexpected action %T", a)
 				return errors.New("unexpected action")
@@ -943,7 +943,7 @@ func setPermissions(g *group, id string, perm string) error {
 	return c.action(permissionsChangedAction{})
 }
 
-func kickClient(g *group, id string) error {
+func kickClient(g *group, id string, message string) error {
 	g.mu.Lock()
 	defer g.mu.Unlock()
 
@@ -957,7 +957,7 @@ func kickClient(g *group, id string) error {
 		return userError("this is not a real user")
 	}
 
-	return c.action(kickAction{})
+	return c.action(kickAction{message})
 }
 
 func handleClientMessage(c *webClient, m clientMessage) error {
@@ -1094,7 +1094,11 @@ func handleClientMessage(c *webClient, m clientMessage) error {
 			if !c.permissions.Op {
 				return c.error(userError("not authorised"))
 			}
-			err := kickClient(c.group, m.Id)
+			message := m.Value
+			if message == "" {
+				message = "you have been kicked"
+			}
+			err := kickClient(c.group, m.Id, message)
 			if err != nil {
 				return c.error(err)
 			}