diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0246f66..8125a98 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,4 +6,4 @@ install(TARGETS commander DESTINATION lib)
 install(FILES "src/commander.h" DESTINATION include)
 
 add_executable(test src/main.cc)
-target_link_libraries(test commander)
\ No newline at end of file
+target_link_libraries(test commander)
diff --git a/src/commander.cc b/src/commander.cc
index 8de7a24..43f5588 100644
--- a/src/commander.cc
+++ b/src/commander.cc
@@ -505,9 +505,9 @@ public:
 
 		// 执行函数
 		auto fn = cmd->execute();
-		if (fn)
-			return fn(CommandArgument(options, arguments));
-		return 1;
+		if (!fn)
+			printUsage(cmd);
+		return fn(CommandArgument(options, arguments));
 	}
 
 private: