diff --git a/lib/libkvm/kvm_getprocs.3 b/lib/libkvm/kvm_getprocs.3
index f68d6b327699..50b1aa9e00ad 100644
--- a/lib/libkvm/kvm_getprocs.3
+++ b/lib/libkvm/kvm_getprocs.3
@@ -95,6 +95,9 @@ processes with effective user id
 .It Sy KERN_PROC_RUID
 processes with real user id
 .Fa arg
+.It Sy KERN_PROC_INC_THREAD
+modifier to return all kernel visible threads when filtering
+by process id, process group, tty, user id, and real user id
 .El
 .Pp
 The number of processes found is returned in the reference parameter