diff --git a/sys/kern/kern_kthread.c b/sys/kern/kern_kthread.c
--- a/sys/kern/kern_kthread.c
+++ b/sys/kern/kern_kthread.c
@@ -296,7 +296,7 @@
 
 	thread_cow_get_proc(newtd, p);
 
-	/* this code almost the same as create_thread() in kern_thr.c */
+	/* This code is similar to thread_create() in kern_thr.c. */
 	p->p_flag |= P_HADTHREADS;
 	thread_link(newtd, p);
 	thread_lock(oldtd);
diff --git a/sys/sys/proc.h b/sys/sys/proc.h
--- a/sys/sys/proc.h
+++ b/sys/sys/proc.h
@@ -258,7 +258,7 @@
 	u_char		td_base_ithread_pri; /* (t) Base ithread pri */
 	struct kmsan_td	*td_kmsan;	/* (k) KMSAN state */
 
-/* Cleared during fork1() */
+/* Cleared during fork1(), thread_create(), or kthread_add(9). */
 #define	td_startzero td_flags
 	int		td_flags;	/* (t) TDF_* flags. */
 	int		td_ast;		/* (t) TDA_* indicators */
@@ -324,7 +324,7 @@
 	u_int		td_ucredref;	/* (k) references on td_realucred */
 #define	td_endzero td_sigmask
 
-/* Copied during fork1() or create_thread(). */
+/* Copied during fork1(), thread_create(), or kthread_add(9). */
 #define	td_startcopy td_endzero
 	sigset_t	td_sigmask;	/* (c) Current signal mask. */
 	u_char		td_rqindex;	/* (t) Run queue index. */
@@ -344,7 +344,7 @@
 #define	td_endcopy td_pcb
 
 /*
- * Fields that must be manually set in fork1() or create_thread()
+ * Fields that must be manually set in fork1(), thread_create(), kthread_add(9),
  * or already have been set in the allocator, constructor, etc.
  */
 	struct pcb	*td_pcb;	/* (k) Kernel VA of pcb and kstack. */