diff --git a/tokio/src/io/util/async_read_ext.rs b/tokio/src/io/util/async_read_ext.rs
index fcd2cce4f7e..50f600c818b 100644
--- a/tokio/src/io/util/async_read_ext.rs
+++ b/tokio/src/io/util/async_read_ext.rs
@@ -238,12 +238,6 @@ cfg_io_util! {
         /// This function reads as many bytes as necessary to completely fill
         /// the specified buffer `buf`.
         ///
-        /// No guarantees are provided about the contents of `buf` when this
-        /// function is called, implementations cannot rely on any property of
-        /// the contents of `buf` being `true`. It is recommended that
-        /// implementations only write data to `buf` instead of reading its
-        /// contents.
-        ///
         /// # Errors
         ///
         /// If the operation encounters an "end of file" before completely