kbuild: document environment variables

Add kbuild.txt to Documentation/kbuild
More stuff can be added later - at least we have
som of the varous environment variables documented now.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/Documentation/kbuild/00-INDEX b/Documentation/kbuild/00-INDEX
index 54a118a20f24..e8d2b6d83a3d 100644
--- a/Documentation/kbuild/00-INDEX
+++ b/Documentation/kbuild/00-INDEX
@@ -1,10 +1,12 @@
 00-INDEX
-        - this file: info on the kernel build process
+        - this file: info on the kernel build process
+kbuild.txt
+        - developer information on kbuild
+kconfig.txt
+        - usage help for make *config
 kconfig-language.txt
         - specification of Config Language, the language in Kconfig files
 makefiles.txt
         - developer information for linux kernel makefiles
-kconfig.txt
-        - usage help for make *config
 modules.txt
         - how to build modules and to install them