diff --git a/Documentation/githooks.txt b/Documentation/githooks.txt
index b63f2ea860..f877f7b7cd 100644
--- a/Documentation/githooks.txt
+++ b/Documentation/githooks.txt
@@ -170,7 +170,8 @@ This hook cannot affect the outcome of 'git checkout'.
 
 It is also run after 'git clone', unless the --no-checkout (-n) option is
 used. The first parameter given to the hook is the null-ref, the second the
-ref of the new HEAD and the flag is always 1.
+ref of the new HEAD and the flag is always 1. Likewise for 'git worktree add'
+unless --no-checkout is used.
 
 This hook can be used to perform repository validity checks, auto-display
 differences from the previous HEAD if different, or set working dir metadata
diff --git a/builtin/worktree.c b/builtin/worktree.c
index 002a569a11..7cef5b120b 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -230,20 +230,21 @@ static int add_worktree(const char *path, const char *refname,
 	int counter = 0, len, ret;
 	struct strbuf symref = STRBUF_INIT;
 	struct commit *commit = NULL;
+	int is_branch = 0;
 
 	if (file_exists(path) && !is_empty_dir(path))
 		die(_("'%s' already exists"), path);
 
 	/* is 'refname' a branch or commit? */
 	if (!opts->detach && !strbuf_check_branch_ref(&symref, refname) &&
-		 ref_exists(symref.buf)) { /* it's a branch */
+	    ref_exists(symref.buf)) {
+		is_branch = 1;
 		if (!opts->force)
 			die_if_checked_out(symref.buf, 0);
-	} else { /* must be a commit */
-		commit = lookup_commit_reference_by_name(refname);
-		if (!commit)
-			die(_("invalid reference: %s"), refname);
 	}
+	commit = lookup_commit_reference_by_name(refname);
+	if (!commit)
+		die(_("invalid reference: %s"), refname);
 
 	name = worktree_basename(path, &len);
 	git_path_buf(&sb_repo, "worktrees/%.*s", (int)(path + len - name), name);
@@ -308,7 +309,7 @@ static int add_worktree(const char *path, const char *refname,
 	argv_array_pushf(&child_env, "%s=%s", GIT_WORK_TREE_ENVIRONMENT, path);
 	cp.git_cmd = 1;
 
-	if (commit)
+	if (!is_branch)
 		argv_array_pushl(&cp.args, "update-ref", "HEAD",
 				 oid_to_hex(&commit->object.oid), NULL);
 	else
@@ -339,6 +340,15 @@ static int add_worktree(const char *path, const char *refname,
 		strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 		unlink_or_warn(sb.buf);
 	}
+
+	/*
+	 * Hook failure does not warrant worktree deletion, so run hook after
+	 * is_junk is cleared, but do return appropriate code when hook fails.
+	 */
+	if (!ret && opts->checkout)
+		ret = run_hook_le(NULL, "post-checkout", oid_to_hex(&null_oid),
+				  oid_to_hex(&commit->object.oid), "1", NULL);
+
 	argv_array_clear(&child_env);
 	strbuf_release(&sb);
 	strbuf_release(&symref);
diff --git a/t/t2025-worktree-add.sh b/t/t2025-worktree-add.sh
index 6ce9b9c070..1285668cfc 100755
--- a/t/t2025-worktree-add.sh
+++ b/t/t2025-worktree-add.sh
@@ -444,4 +444,33 @@ test_expect_success 'git worktree --no-guess-remote option overrides config' '
 	)
 '
 
+post_checkout_hook () {
+	test_when_finished "rm -f .git/hooks/post-checkout" &&
+	mkdir -p .git/hooks &&
+	write_script .git/hooks/post-checkout <<-\EOF
+	echo $* >hook.actual
+	EOF
+}
+
+test_expect_success '"add" invokes post-checkout hook (branch)' '
+	post_checkout_hook &&
+	printf "%s %s 1\n" $_z40 $(git rev-parse HEAD) >hook.expect &&
+	git worktree add gumby &&
+	test_cmp hook.expect hook.actual
+'
+
+test_expect_success '"add" invokes post-checkout hook (detached)' '
+	post_checkout_hook &&
+	printf "%s %s 1\n" $_z40 $(git rev-parse HEAD) >hook.expect &&
+	git worktree add --detach grumpy &&
+	test_cmp hook.expect hook.actual
+'
+
+test_expect_success '"add --no-checkout" suppresses post-checkout hook' '
+	post_checkout_hook &&
+	rm -f hook.actual &&
+	git worktree add --no-checkout gloopy &&
+	test_path_is_missing hook.actual
+'
+
 test_done