diff --git a/library/core/src/num/uint_macros.rs b/library/core/src/num/uint_macros.rs
index 46e64c33b84..b6bb06f9d64 100644
--- a/library/core/src/num/uint_macros.rs
+++ b/library/core/src/num/uint_macros.rs
@@ -1924,7 +1924,8 @@ 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
         ///