From 2a21555ea7861f640931b1fd2458f6f7bdb3253e Mon Sep 17 00:00:00 2001
From: Ben Boeckel <ben.boeckel@kitware.com>
Date: Fri, 2 Sep 2022 08:20:53 -0400
Subject: ExternalProject: note the default of `GIT_TAG` being `master`

Reported on Discourse:

    https://discourse.cmake.org/t/fetchcontent-makeavailable-invalid-reference-master/6386
---
 Modules/ExternalProject.cmake | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Modules/ExternalProject.cmake b/Modules/ExternalProject.cmake
index c7948cd..9952658 100644
--- a/Modules/ExternalProject.cmake
+++ b/Modules/ExternalProject.cmake
@@ -301,6 +301,9 @@ External Project Definition
         If ``GIT_SHALLOW`` is enabled then ``GIT_TAG`` works only with
         branch names and tags.  A commit hash is not allowed.
 
+        Note that if not provided, ``GIT_TAG`` defaults to ``master``, not the
+        default Git branch name.
+
       ``GIT_REMOTE_NAME <name>``
         The optional name of the remote. If this option is not specified, it
         defaults to ``origin``.
-- 
cgit v0.12