3 files changed, 23 insertions, 3 deletions
diff --git a/lib/libc/sys/mkdir.2 b/lib/libc/sys/mkdir.2
index 3cbe9ad794ea..854c692f24e3 100644
--- a/lib/libc/sys/mkdir.2
+++ b/lib/libc/sys/mkdir.2
@@ -178,4 +178,4 @@ system call appeared in
 The
 .Fn mkdir
 system call appeared in
-.At v1 .
+.Bx 4.2 .
diff --git a/lib/libc/sys/revoke.2 b/lib/libc/sys/revoke.2
index dc92512d3129..db0c8a85558b 100644
--- a/lib/libc/sys/revoke.2
+++ b/lib/libc/sys/revoke.2
@@ -30,7 +30,7 @@
 .\"
 .\"     @(#)revoke.2	8.1 (Berkeley) 6/4/93
 .\"
-.Dd January 25, 2016
+.Dd October 24, 2025
 .Dt REVOKE 2
 .Os
 .Sh NAME
@@ -64,7 +64,7 @@ using a special close method which does not block.
 Access to a file may be revoked only by its owner or the super user.
 The
 .Fn revoke
-system call is currently supported only for block and character special
+system call is currently supported only for character special
 device files.
 It is normally used to prepare a terminal device for a new login session,
 preventing any access by a previous user of the terminal.
diff --git a/lib/libc/sys/write.2 b/lib/libc/sys/write.2
index adf60aa91d7a..2f0a9d034038 100644
--- a/lib/libc/sys/write.2
+++ b/lib/libc/sys/write.2
@@ -134,6 +134,26 @@ and
 may write fewer bytes than requested;
 the return value must be noted,
 and the remainder of the operation should be retried when possible.
+.Sh ATOMICITY OF WRITES
+When operating on regular files on local file systems, the effects of
+.Fn write
+are atomic.
+As required by the POSIX standard,
+the
+.Fn read ,
+.Fn write ,
+and
+.Fn ftruncate
+functions and their variations are atomic with respect to
+each other on the file data and metadata for regular files.
+See for instance
+.St -p1003.1-2024
+Volume 2, Section 2.9.7 for more information.
+.Pp
+.Fx
+implements the requirement by taking
+a read/write range lock on the file byte range
+affected by the corresponding function.
 .Sh RETURN VALUES
 Upon successful completion the number of bytes which were written
 is returned.