diff --git a/library/std/src/net/tcp.rs b/library/std/src/net/tcp.rs
index dac568e419f3..a8046a5541c5 100644
--- a/library/std/src/net/tcp.rs
+++ b/library/std/src/net/tcp.rs
@@ -582,8 +582,8 @@ pub fn take_error(&self) -> io::Result<Option<io::Error>> {
     /// to be retried, an error with kind [`io::ErrorKind::WouldBlock`] is
     /// returned.
     ///
-    /// On Unix platforms, calling this method corresponds to calling `fcntl`
-    /// `FIONBIO`. On Windows calling this method corresponds to calling
+    /// On most Unix platforms, calling this method corresponds to calling `ioctl`
+    /// `FIONBIO`. On Windows, calling this method corresponds to calling
     /// `ioctlsocket` `FIONBIO`.
     ///
     /// # Examples
@@ -988,8 +988,8 @@ pub fn take_error(&self) -> io::Result<Option<io::Error>> {
     /// IO operation could not be completed and needs to be retried, an error
     /// with kind [`io::ErrorKind::WouldBlock`] is returned.
     ///
-    /// On Unix platforms, calling this method corresponds to calling `fcntl`
-    /// `FIONBIO`. On Windows calling this method corresponds to calling
+    /// On most Unix platforms, calling this method corresponds to calling `ioctl`
+    /// `FIONBIO`. On Windows, calling this method corresponds to calling
     /// `ioctlsocket` `FIONBIO`.
     ///
     /// # Examples
diff --git a/library/std/src/net/udp.rs b/library/std/src/net/udp.rs
index 5da6b38037f0..cd925b9bdfdf 100644
--- a/library/std/src/net/udp.rs
+++ b/library/std/src/net/udp.rs
@@ -786,8 +786,8 @@ pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
     /// and needs to be retried, an error with kind
     /// [`io::ErrorKind::WouldBlock`] is returned.
     ///
-    /// On Unix platforms, calling this method corresponds to calling `fcntl`
-    /// `FIONBIO`. On Windows calling this method corresponds to calling
+    /// On most Unix platforms, calling this method corresponds to calling `ioctl`
+    /// `FIONBIO`. On Windows, calling this method corresponds to calling
     /// `ioctlsocket` `FIONBIO`.
     ///
     /// # Examples