diff --git a/library/core/src/num/uint_macros.rs b/library/core/src/num/uint_macros.rs
index 02a5ed4ca800e..7264088bb95fd 100644
--- a/library/core/src/num/uint_macros.rs
+++ b/library/core/src/num/uint_macros.rs
@@ -1927,7 +1927,8 @@ macro_rules! uint_impl {
         }
 
         /// Calculates the smallest value greater than or equal to `self` that
-        /// is a multiple of `rhs`. If `rhs` is negative,
+        /// is a multiple of `rhs`. Returns `None` is `rhs` is zero or the
+        /// operation would result in overflow.
         ///
         /// # Examples
         ///