diff --git a/datafusion/expr/src/expr.rs b/datafusion/expr/src/expr.rs
index 0818c2062ea3..025a48731d48 100644
--- a/datafusion/expr/src/expr.rs
+++ b/datafusion/expr/src/expr.rs
@@ -630,6 +630,7 @@ impl Sort {
         }
     }
 
+    /// Replaces the Sort expressions with `expr`
     pub fn with_expr(&self, expr: Expr) -> Self {
         Self {
             expr,