From: Prarit Bhargava <prarit@redhat.com>

Subject: Document .os_release in README

commit f8f1490cb2c6754aa108779e04fa2f099e394895
Author: Andi Kleen <ak@linux.intel.com>
Date:   Mon May 22 09:38:47 2017 -0700

    Document .os_release in README
    
    Signed-off-by: Andi Kleen <ak@linux.intel.com>

diff --git a/README.md b/README.md
index 7e848a598e40ee4ef7162bbad8c1280d001b9dbd..d47928ff614934730105c314aef1c7a084e16a6a 100644
--- a/README.md
+++ b/README.md
@@ -55,6 +55,10 @@ error predictive failure analysis) require a continuously running daemon.
 You can run mcelog from systemd or similar daemons. An example systemd unit
 file is in `mcelog.service`.
 
+By default mcelog reports its version as the git tag. This can be overridden
+by setting up a .os_release file in the source directory. A build system
+could write the OS version to this file to mark the binary.
+
 ### For older distributions using init scripts
 
 Please install an init script by default that runs mcelog in daemon mode.