diff --git a/usr.bin/pkill/pkill.1 b/usr.bin/pkill/pkill.1
index 98f3ed8bf932..6b633a6edb4b 100644
--- a/usr.bin/pkill/pkill.1
+++ b/usr.bin/pkill/pkill.1
@@ -91,10 +91,10 @@ list
 Restrict matches to processes with a parent process ID in the
 comma-separated list
 .Ar ppid .
-.It Fl M
+.It Fl M Ar core
 Extract values associated with the name list from the specified core
 instead of the currently running system.
-.It Fl N
+.It Fl N Ar system
 Extract the name list from the specified system instead of the default,
 which is the kernel image the system has booted from.
 .It Fl U Ar uid