diff --git a/src/libcore/num/mod.rs b/src/libcore/num/mod.rs
index d094f05374b7..ed370bb91648 100644
--- a/src/libcore/num/mod.rs
+++ b/src/libcore/num/mod.rs
@@ -479,7 +479,7 @@ macro_rules! int_impl {
             }
         }
 
-        /// Checked negation. Computes `!self`, returning `None` if `self ==
+        /// Checked negation. Computes `-self`, returning `None` if `self ==
         /// MIN`.
         ///
         /// # Examples