README: Document how build dependencies are extracted.

diff --git a/README b/README
index 7b575b5da8b8b2ede674a440c7bd922dca127947..8944b54b55e1c3d57239022a6fb4837b1f8e39c6 100644 (file)
--- a/README
+++ b/README
@@ -100,6 +100,14 @@ following line (output of dpkg-buildpackage):
 The available hardening flags are adapted to the architecture because some
 architectures don't support certain hardening options.
 
+Some checks (Ada and hardening-wrapper at the moment) check the build
+dependencies for certain packages. The following lines are used to get the
+build dependencies. The first is used in buildd build logs, the second by
+pbuilder logs, both are detected:
+
+    Build-Depends: ...
+    Depends: ...
+
 
 LIMITATIONS
 -----------