diff --git a/src/main/java/org/bukkit/craftbukkit/help/SimpleHelpMap.java b/src/main/java/org/bukkit/craftbukkit/help/SimpleHelpMap.java
index a369fd753..23bd9f09d 100644
--- a/src/main/java/org/bukkit/craftbukkit/help/SimpleHelpMap.java
+++ b/src/main/java/org/bukkit/craftbukkit/help/SimpleHelpMap.java
@@ -224,7 +224,7 @@ public class SimpleHelpMap implements HelpMap {
 
     @Override
     public void registerHelpTopicFactory(Class commandClass, HelpTopicFactory factory) {
-        Preconditions.checkArgument(Command.class.isAssignableFrom(commandClass) && CommandExecutor.class.isAssignableFrom(commandClass), "commandClass (%s) must implement either Command or CommandExecutor", commandClass.getName());
+        Preconditions.checkArgument(Command.class.isAssignableFrom(commandClass) || CommandExecutor.class.isAssignableFrom(commandClass), "commandClass (%s) must implement either Command or CommandExecutor", commandClass.getName());
         topicFactoryMap.put(commandClass, factory);
     }