1 files changed, 10 insertions, 1 deletions

diff --git a/share/man/man4/re.4 b/share/man/man4/re.4
index 0020af64b330..6d190c944b34 100644
--- a/share/man/man4/re.4
+++ b/share/man/man4/re.4
@@ -28,7 +28,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 .\" THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd June 9, 2026
+.Dd July 13, 2026
 .Dt RE 4
 .Os
 .Sh NAME
@@ -182,6 +182,15 @@ Tunables can be set at the
 prompt before booting the kernel or stored in
 .Xr loader.conf 5 .
 .Bl -tag -width "xxxxxx"
+.It Va hw.re.aspm_disable
+This tunable controls whether the driver disables PCI Express ASPM
+(the L0s and L1 link states and CLKREQ) on the device.
+ASPM is a known trigger of transmit stalls and watchdog timeouts on
+many supported controllers, so it is disabled by default.
+Set to 0 to keep the ASPM configuration programmed by the firmware,
+trading reliability under sustained transmit load for lower link
+power consumption.
+The default value is 1.
 .It Va hw.re.intr_filter
 This tunable makes driver use interrupt filter handler on
 controllers that support MSI/MSI-X capability.