3 files changed, 23 insertions, 4 deletions
diff --git a/lib/libsys/clock_gettime.2 b/lib/libsys/clock_gettime.2
index 89551d0f720b..841673648dfc 100644
--- a/lib/libsys/clock_gettime.2
+++ b/lib/libsys/clock_gettime.2
@@ -27,7 +27,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd August 10, 2024
+.Dd October 15, 2025
 .Dt CLOCK_GETTIME 2
 .Os
 .Sh NAME
@@ -80,7 +80,6 @@ Behavior during a leap second is not defined by and POSIX standard.
 Increments in SI seconds, even while the system is suspended.
 Its epoch is unspecified.
 The count is not adjusted by leap seconds.
-.Fx implements
 .It Dv CLOCK_UPTIME
 .It Dv CLOCK_UPTIME_PRECISE
 .It Dv CLOCK_UPTIME_FAST
diff --git a/lib/libsys/getrlimitusage.2 b/lib/libsys/getrlimitusage.2
index e2114def56c2..d0e92d7f88b4 100644
--- a/lib/libsys/getrlimitusage.2
+++ b/lib/libsys/getrlimitusage.2
@@ -25,7 +25,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd September 27, 2024
+.Dd October 24, 2025
 .Dt GETRLIMITUSAGE 2
 .Os
 .Sh NAME
@@ -97,4 +97,4 @@ and
 The
 .Fn getrlimitusage
 system call appeared in
-.Bx 15.0 .
+.Fx 14.2 .
diff --git a/lib/libsys/write.2 b/lib/libsys/write.2
index d2ff41ceead9..77067893ab4c 100644
--- a/lib/libsys/write.2
+++ b/lib/libsys/write.2
@@ -132,6 +132,26 @@ 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.