diff --git a/docling/datamodel/base_models.py b/docling/datamodel/base_models.py
index 55a19ac3..b71c0f97 100644
--- a/docling/datamodel/base_models.py
+++ b/docling/datamodel/base_models.py
@@ -41,6 +41,7 @@ class InputFormat(str, Enum):
 class OutputFormat(str, Enum):
     MARKDOWN = "md"
     JSON = "json"
+    HTML = "html"
     TEXT = "text"
     DOCTAGS = "doctags"