diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c
--- a/sys/kern/kern_sig.c
+++ b/sys/kern/kern_sig.c
@@ -1825,7 +1825,7 @@
 
 /*
  * Common code for kill process group/broadcast kill.
- * cp is calling process.
+ * td is the calling thread, as usual.
  */
 static int
 killpg1(struct thread *td, int sig, int pgid, int all, ksiginfo_t *ksi)