diff --git a/src/core/types.ml b/src/core/types.ml
index 9495ac2..9472385 100644
--- a/src/core/types.ml
+++ b/src/core/types.ml
@@ -7,6 +7,7 @@ type user_data =
   [ `Int of int
   | `String of string
   | `Bool of bool
+  | `Float of float
   | `None
   ]
 (** User defined data, generally passed as key/value pairs to