diff --git a/lint/README.md b/lint/README.md
index a5ce07c..9f48c1c 100644
--- a/lint/README.md
+++ b/lint/README.md
@@ -4,5 +4,5 @@ peglint
 The lint utility for PEG.
 
 ```
-usage: peglint [--ast] [--optimize_ast_nodes|--opt] [--server [PORT=1234]] [--trace] [grammar file path] [source file path]
+usage: peglint [--ast] [--optimize_ast_nodes|--opt] [--server [PORT]] [--trace] [grammar file path] [source file path]
 ```
diff --git a/lint/peglint.cc b/lint/peglint.cc
index c8f9bb6..f3c25a0 100644
--- a/lint/peglint.cc
+++ b/lint/peglint.cc
@@ -58,7 +58,7 @@ int main(int argc, const char** argv)
     }
 
     if ((path_list.empty() && !opt_server) || opt_help) {
-        cerr << "usage: peglint [--ast] [--optimize_ast_nodes|--opt] [--server [PORT=1234]] [--trace] [grammar file path] [source file path]" << endl;
+        cerr << "usage: peglint [--ast] [--optimize_ast_nodes|--opt] [--server [PORT]] [--trace] [grammar file path] [source file path]" << endl;
         return 1;
     }