diff --git a/backend/mirai-console/src/internal/command/CommandReflector.kt b/backend/mirai-console/src/internal/command/CommandReflector.kt
index 1bf73d773..867c50ec3 100644
--- a/backend/mirai-console/src/internal/command/CommandReflector.kt
+++ b/backend/mirai-console/src/internal/command/CommandReflector.kt
@@ -174,7 +174,8 @@ internal class CommandReflector(
                 is AbstractCommandValueParameter.Extended,
                 is AbstractCommandValueParameter.UserDefinedType<*>,
                 -> {
-                    "<${this.name ?: this.type.classifierAsKClass().simpleName}>"
+                    val nameToRender = this.name ?: this.type.classifierAsKClass().simpleName
+                    if (isOptional) "[$nameToRender]" else "<$nameToRender>"
                 }
                 is AbstractCommandValueParameter.StringConstant -> {
                     this.expectingValue