diff --git a/arrow-schema/src/datatype.rs b/arrow-schema/src/datatype.rs
index 32eb95aef8a4..ff5832dfa68c 100644
--- a/arrow-schema/src/datatype.rs
+++ b/arrow-schema/src/datatype.rs
@@ -622,7 +622,7 @@ impl DataType {
         }
     }
 
-    /// Returns the bit width of this type if it is a primitive type
+    /// Returns the byte width of this type if it is a primitive type
     ///
     /// Returns `None` if not a primitive type
     #[inline]