the stdout fd contains the build log

Using a pipe enables streaming of logs, which would not be possible with
a regular file output.

1 files changed, 2 insertions, 1 deletions

diff --git a/README.md b/README.md
index 603d157..66b9fa7 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,8 @@ The output directory `out` is supposed to be an empty directory. Then run one
 of the backends `mdbp-BACKEND [BACKENDOPTIONS] REQUEST.json`. The process
 blocks until the build has finished and its return code signifies success or
 failure of the operation. Usage of unsupported parameters of the particular
-backend result in a failure of the operation as a whole.
+backend result in a failure of the operation as a whole. The content of the
+stdout file descriptor is to be considered the build log.
 
 When to use mdbp?
 -----------------