diff --git a/lib/libc/string/string.3 b/lib/libc/string/string.3
--- a/lib/libc/string/string.3
+++ b/lib/libc/string/string.3
@@ -29,7 +29,7 @@
 .\"
 .\"     @(#)string.3	8.2 (Berkeley) 12/11/93
 .\"
-.Dd December 11, 1993
+.Dd September 2, 2023
 .Dt STRING 3
 .Os
 .Sh NAME
@@ -132,7 +132,8 @@
 .Xr strsep 3 ,
 .Xr strspn 3 ,
 .Xr strstr 3 ,
-.Xr strtok 3
+.Xr strtok 3 ,
+.Xr simd 7
 .Sh STANDARDS
 The
 .Fn strcat ,
diff --git a/share/man/man7/arch.7 b/share/man/man7/arch.7
--- a/share/man/man7/arch.7
+++ b/share/man/man7/arch.7
@@ -24,7 +24,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd April 12, 2023
+.Dd September 2, 2023
 .Dt ARCH 7
 .Os
 .Sh NAME
@@ -431,7 +431,8 @@
 .El
 .Sh SEE ALSO
 .Xr src.conf 5 ,
-.Xr build 7
+.Xr build 7 ,
+.Xr simd 7
 .Sh HISTORY
 An
 .Nm
diff --git a/share/man/man7/environ.7 b/share/man/man7/environ.7
--- a/share/man/man7/environ.7
+++ b/share/man/man7/environ.7
@@ -27,7 +27,7 @@
 .\"
 .\"	@(#)environ.7	8.3 (Berkeley) 4/19/94
 .\"
-.Dd August 5, 2020
+.Dd September 3, 2023
 .Dt ENVIRON 7
 .Os
 .Sh NAME
@@ -66,6 +66,13 @@
 section of the appropriate manual page.
 .Sh ENVIRONMENT
 .Bl -tag -width LD_LIBRARY_PATH
+.It Ev ARCHLEVEL
+On
+.Em amd64 ,
+controls the level of SIMD enhancements used.
+See
+.Xr simd 7
+for details.
 .It Ev BLOCKSIZE
 The size of the block units used by several disk-related commands,
 most notably
@@ -305,7 +312,8 @@
 .Xr setlocale 3 ,
 .Xr system 3 ,
 .Xr termcap 3 ,
-.Xr termcap 5
+.Xr termcap 5 ,
+.Xr simd 7
 .Sh HISTORY
 The
 .Nm