diff --git a/src/lib.rs b/src/lib.rs
index 3e851bf..7dfa5e5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -10,24 +10,26 @@ use std::{
 ///
 /// The data structure is not thread safe.
 /// It is not even safe to move to another thread.
-/// (i.e., !Send).
+/// (!Send and !Sync for whatever type of T).
+///
+/// Not sync.
 /// ```compile_fail,E0277
 /// use cdlist::LinkNode;
 /// use std::sync::atomic::AtomicUsize;
 ///
-/// fn impl_send<T: Send>(val: T) {}
+/// fn impl_sync<T: Sync>(val: T) {}
 /// /// should not compile
-/// impl_send(LinkNode::new(AtomicUsize::new(0)));
+/// impl_sync(LinkNode::new(AtomicUsize::new(0)));
 /// ```
 ///
-/// Nor sync:
+/// Not send.
 /// ```compile_fail,E0277
 /// use cdlist::LinkNode;
 /// use std::sync::atomic::AtomicUsize;
 ///
-/// fn impl_sync<T: Sync>(val: T) {}
+/// fn impl_send<T: Send>(val: T) {}
 /// /// should not compile
-/// impl_sync(LinkNode::new(AtomicUsize::new(0)));
+/// impl_send(LinkNode::new(AtomicUsize::new(0)));
 /// ```
 pub struct LinkNode<T>(Pin<Box<Inner<T>>>);