diff --git a/src/main/java/com/github/jie65535/openchat/commands/ChatPlayerCommands.java b/src/main/java/com/github/jie65535/openchat/commands/ChatPlayerCommands.java
index ca09524..48b6fe5 100644
--- a/src/main/java/com/github/jie65535/openchat/commands/ChatPlayerCommands.java
+++ b/src/main/java/com/github/jie65535/openchat/commands/ChatPlayerCommands.java
@@ -43,6 +43,8 @@ public class ChatPlayerCommands implements CommandHandler {
             set.add(targetPlayer.getUid());
             OpenChatPlugin.getInstance().saveData();
             CommandHandler.sendMessage(sender, "OK");
+        } else {
+            sendUsageMessage(sender);
         }
     }
 }
diff --git a/src/main/java/com/github/jie65535/openchat/commands/ChatServerCommands.java b/src/main/java/com/github/jie65535/openchat/commands/ChatServerCommands.java
index 95827de..bf20ae4 100644
--- a/src/main/java/com/github/jie65535/openchat/commands/ChatServerCommands.java
+++ b/src/main/java/com/github/jie65535/openchat/commands/ChatServerCommands.java
@@ -98,6 +98,7 @@ public class ChatServerCommands implements CommandHandler {
                 plugin.loadConfig();
                 CommandHandler.sendMessage(sender, "OK");
             }
+            default -> sendUsageMessage(sender);
         }
     }
 }