diff --git a/CliFx.Tests/CliApplicationTests.cs b/CliFx.Tests/CliApplicationTests.cs
index e4abbdd..2553908 100644
--- a/CliFx.Tests/CliApplicationTests.cs
+++ b/CliFx.Tests/CliApplicationTests.cs
@@ -257,10 +257,10 @@ namespace CliFx.Tests
                     "Description",
                     "Command using positional parameters",
                     "Usage",
-                    TestAppName, "param cmd", "<first>", "<PARAMETERB>", "<third list>", "[options]",
+                    TestAppName, "param cmd", "<first>", "<parameterb>", "<third list>", "[options]",
                     "Parameters",
                     "* first",
-                    "* PARAMETERB",
+                    "* parameterb",
                     "* third list", "A list of numbers",
                     "Options",
                     "-o|--option",
diff --git a/CliFx/Domain/CommandParameterSchema.cs b/CliFx/Domain/CommandParameterSchema.cs
index 82a83db..b1e8da9 100644
--- a/CliFx/Domain/CommandParameterSchema.cs
+++ b/CliFx/Domain/CommandParameterSchema.cs
@@ -12,7 +12,7 @@ namespace CliFx.Domain
 
         public string DisplayName => !string.IsNullOrWhiteSpace(Name)
             ? Name
-            : Property.Name.ToUpperInvariant();
+            : Property.Name.ToLowerInvariant();
 
         public CommandParameterSchema(PropertyInfo property, int order, string? name, string? description)
             : base(property, description)