diff --git a/src/libcore/cmp.rs b/src/libcore/cmp.rs
index 33d2f729e1a1..7882a8ce5c8e 100644
--- a/src/libcore/cmp.rs
+++ b/src/libcore/cmp.rs
@@ -379,8 +379,9 @@ impl<T: Ord> Ord for Reverse<T> {
 ///
 /// ## Derivable
 ///
-/// This trait can be used with `#[derive]`. When `derive`d, it will produce a lexicographic
-/// ordering based on the top-to-bottom declaration order of the struct's members.
+/// This trait can be used with `#[derive]`. When `derive`d on structs, it will produce a
+/// lexicographic ordering based on the top-to-bottom declaration order of the struct's members.
+/// When `derive`d on enums, variants are ordered by their top-to-bottom declaration order.
 ///
 /// ## How can I implement `Ord`?
 ///
@@ -512,8 +513,9 @@ impl PartialOrd for Ordering {
 ///
 /// ## Derivable
 ///
-/// This trait can be used with `#[derive]`. When `derive`d, it will produce a lexicographic
-/// ordering based on the top-to-bottom declaration order of the struct's members.
+/// This trait can be used with `#[derive]`. When `derive`d on structs, it will produce a
+/// lexicographic ordering based on the top-to-bottom declaration order of the struct's members.
+/// When `derive`d on enums, variants are ordered by their top-to-bottom declaration order.
 ///
 /// ## How can I implement `PartialOrd`?
 ///