diff --git a/src/dispatch/bind_define.h b/src/dispatch/bind_define.h
index 3fd2d46a..34731b9f 100644
--- a/src/dispatch/bind_define.h
+++ b/src/dispatch/bind_define.h
@@ -366,6 +366,8 @@ int32_t smartkillclient(const Arg *arg) {
 		return 0;
 
 	uint32_t newtags = c->tags & ~(c->mon->tagset[c->mon->seltags] & TAGMASK);
+	// Kill the client if it's single-tag, or if removing the tag(s) would leave
+	// it on none
 	if (__builtin_popcount(c->tags & TAGMASK) <= 1 || !newtags) {
 		pending_kill_client(c);
 		return 0;