docs: add note about config-gen purpose

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/Documentation/howto-build-sys.txt b/Documentation/howto-build-sys.txt
index 36f8e3035ef6f699decabae9ae5420bb03cf2565..7565c45b8c4a56ef5af8cec075c9cd373064d3a9 100644 (file)
--- a/Documentation/howto-build-sys.txt
+++ b/Documentation/howto-build-sys.txt
@@ -50,6 +50,10 @@ util-linux build system
 
    will use the default distro flags.
 
+   WARNING: config-gen is not designed for end-user or downstream distributions!
+            It's for development purpose only. All end-users and downstream have
+            to use standard ./configure script only.
+
  - the tools/config-gen script is also used for build system regression tests,
    the test is not enabled by default, you have to use