diff --git a/share/man/man9/devstat.9 b/share/man/man9/devstat.9
--- a/share/man/man9/devstat.9
+++ b/share/man/man9/devstat.9
@@ -25,7 +25,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd July 15, 2020
+.Dd October 28, 2025
 .Dt DEVSTAT 9
 .Os
 .Sh NAME
@@ -241,7 +241,7 @@
 The bio must be ready for
 .Fn biodone
 (i.e.,
-.Fa bio_bcount
+.Fa bio_length
 and
 .Fa bio_resid
 must be correctly initialized).