diff --git a/arrow-schema/src/extension/mod.rs b/arrow-schema/src/extension/mod.rs
index c5119873af0c..92b0024bfd2d 100644
--- a/arrow-schema/src/extension/mod.rs
+++ b/arrow-schema/src/extension/mod.rs
@@ -247,7 +247,7 @@ pub trait ExtensionType: Sized {
     /// - deserialization of metadata fails
     fn deserialize_metadata(metadata: Option<&str>) -> Result<Self::Metadata, ArrowError>;
 
-    /// Returns `OK())` iff the given data type is supported by this extension
+    /// Returns `Ok(())` iff the given data type is supported by this extension
     /// type.
     fn supports_data_type(&self, data_type: &DataType) -> Result<(), ArrowError>;