diff --git a/share/man/man9/kasan.9 b/share/man/man9/kasan.9
--- a/share/man/man9/kasan.9
+++ b/share/man/man9/kasan.9
@@ -90,6 +90,12 @@
 .Pp
 The
 .Nm
+runtime in a KASAN-configured kernel can be disabled by
+setting the loader tunable
+.Sy debug.kasan.disable=1 .
+.Pp
+The
+.Nm
 runtime works by maintaining a shadow map for the kernel map.
 There exists a linear mapping between addresses in the kernel map and addresses
 in the shadow map.