diff --git a/tokio/src/io/poll_evented.rs b/tokio/src/io/poll_evented.rs
index cc5db039d58..6e56f126ebe 100644
--- a/tokio/src/io/poll_evented.rs
+++ b/tokio/src/io/poll_evented.rs
@@ -194,7 +194,7 @@ feature! {
 
                 match self.io.as_ref().unwrap().write(buf) {
                     Ok(n) => {
-                        // if we read a partially full buffer, this is sufficient on unix to show
+                        // if we write only part of our buffer, this is sufficient on unix to show
                         // that the socket buffer has been drained
                         if n > 0 && (!cfg!(windows) && n < buf.len()) {
                             self.registration.clear_readiness(evt);