diff --git a/src/rougail/output_formatter/__init__.py b/src/rougail/output_formatter/__init__.py
index f4e61d0..b725656 100644
--- a/src/rougail/output_formatter/__init__.py
+++ b/src/rougail/output_formatter/__init__.py
@@ -240,6 +240,9 @@ class RougailOutputFormatter:
             # if boolean, the default value is True
             del variable["type"]
             variable["default"] = True
+        if "default" not in variable and variable.get("multi") is True and not set(variable) - {'default', 'description', "multi"}:
+            variable["default"] = []
+            del(variable['multi'])
         if not isinstance(variable.get("default"), dict) and not set(variable) - {'default', 'description'}:
             # shorthand notation
             default = variable.get('default')