[Buildroot] [PATCH 1/1] docs/manual: update pkg-kconfig doc about <pkg>-diff-config

[Marcel Patzlaff]

Briefly states what the output of this target is about.

Signed-off-by: Marcel Patzlaff <m.patzlaff at pilz.de>
---
 docs/manual/adding-packages-kconfig.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/docs/manual/adding-packages-kconfig.txt b/docs/manual/adding-packages-kconfig.txt
index 982c1229ea..fa0bfd2b29 100644
--- a/docs/manual/adding-packages-kconfig.txt
+++ b/docs/manual/adding-packages-kconfig.txt
@@ -43,6 +43,11 @@ This snippet creates the following make targets:
   options that differ from the default values. It is not possible to
   use this target when fragment files are set.
 
+* +foo-diff-config+, which outputs differences between the current
+  configuration and the one obtained by merging the defconfig with all set
+  configuration fragment files. The output is useful to identify entries
+  that are not yet in any configuration fragment file.
+
 and ensures that the source configuration file is copied to the build
 directory at the right moment.
 
-- 
2.17.1

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