diff --git a/library/std/src/io/buffered/bufreader.rs b/library/std/src/io/buffered/bufreader.rs
index a66e6ccf673..7097dfef88d 100644
--- a/library/std/src/io/buffered/bufreader.rs
+++ b/library/std/src/io/buffered/bufreader.rs
@@ -53,7 +53,7 @@ pub struct BufReader<R: ?Sized> {
 }
 
 impl<R: Read> BufReader<R> {
-    /// Creates a new `BufReader<R>` with a default buffer capacity. The default is currently 8 KB,
+    /// Creates a new `BufReader<R>` with a default buffer capacity. The default is currently 8 KiB,
     /// but may change in the future.
     ///
     /// # Examples
diff --git a/library/std/src/io/buffered/bufwriter.rs b/library/std/src/io/buffered/bufwriter.rs
index 0e2450655e5..0f04f291117 100644
--- a/library/std/src/io/buffered/bufwriter.rs
+++ b/library/std/src/io/buffered/bufwriter.rs
@@ -81,7 +81,7 @@ pub struct BufWriter<W: ?Sized + Write> {
 }
 
 impl<W: Write> BufWriter<W> {
-    /// Creates a new `BufWriter<W>` with a default buffer capacity. The default is currently 8 KB,
+    /// Creates a new `BufWriter<W>` with a default buffer capacity. The default is currently 8 KiB,
     /// but may change in the future.
     ///
     /// # Examples