diff --git a/lib/libc/string/ffs.3 b/lib/libc/string/ffs.3
--- a/lib/libc/string/ffs.3
+++ b/lib/libc/string/ffs.3
@@ -79,6 +79,8 @@
 argument was zero.
 .Sh SEE ALSO
 .Xr bitstring 3 ,
+.Xr stdc_first_trailing_one 3 ,
+.Xr stdc_trailing_zeros 3 ,
 .Xr bitset 9
 .Sh STANDARDS
 The
diff --git a/share/man/man3/bitstring.3 b/share/man/man3/bitstring.3
--- a/share/man/man3/bitstring.3
+++ b/share/man/man3/bitstring.3
@@ -461,6 +461,7 @@
 .Ed
 .Sh SEE ALSO
 .Xr malloc 3 ,
+.Xr stdbit 3 ,
 .Xr bitset 9
 .Sh HISTORY
 The
diff --git a/share/man/man3/intro.3 b/share/man/man3/intro.3
--- a/share/man/man3/intro.3
+++ b/share/man/man3/intro.3
@@ -24,7 +24,7 @@
 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
-.Dd November 27, 2024
+.Dd November 10, 2025
 .Dt INTRO 3
 .Os
 .Sh NAME
@@ -72,13 +72,20 @@
 .It database routines
 see
 .Xr db 3
-.It bit operators
+.It bit string operators
 see
 .Xr bitstring 3
+.It bit and byte utilities
+see
+.Xr stdbit 3
 .It string operators
 see
 .Xr string 3
+and
+.Xr bstring 3
 .It character tests and character operators
+see
+.Xr ctype 3
 .It storage allocation
 see
 .Xr mpool 3