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-rw-r--r--src/libcore/num/mod.rs3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libcore/num/mod.rs b/src/libcore/num/mod.rs
index 0c7832168bb..8c4a6e871e1 100644
--- a/src/libcore/num/mod.rs
+++ b/src/libcore/num/mod.rs
@@ -2340,6 +2340,9 @@ macro_rules! uint_impl {
         }
 
         /// Returns the smallest power of two greater than or equal to `self`.
+        /// When return value overflows, it panics in debug mode and return
+        /// value is wrapped in release mode.
+        ///
         /// More details about overflow behavior can be found in [RFC 560].
         ///
         /// # Examples