diff --git a/src/schemabuilder.rs b/src/schemabuilder.rs
index 76c972c..17493c0 100644
--- a/src/schemabuilder.rs
+++ b/src/schemabuilder.rs
@@ -132,7 +132,7 @@ impl SchemaBuilder {
         Ok(self.clone())
     }
 
-    #[args(stored = false, indexed = false)]
+    #[pyo3(signature = (name, stored = false, indexed = false, fast = None))]
     fn add_float_field(
         &mut self,
         name: &str,