diff --git a/datafusion/physical-expr/src/aggregate/utils.rs b/datafusion/physical-expr/src/aggregate/utils.rs
index b06a353832e3..3fe90f59945e 100644
--- a/datafusion/physical-expr/src/aggregate/utils.rs
+++ b/datafusion/physical-expr/src/aggregate/utils.rs
@@ -43,7 +43,7 @@ pub fn get_accum_scalar_values_as_arrays(
         .collect::<Vec<_>>())
 }
 
-/// Computes averages for `Decimal128` values, checking for overflow
+/// Computes averages for `Decimal128`/`Decimal256` values, checking for overflow
 ///
 /// This is needed because different precisions for Decimal128/Decimal256 can
 /// store different ranges of values and thus sum/count may not fit in