docs: Add supported versions and fix-backport policy

Change-Id: Idb22c6487e2397b807c5d1b78acbc2adb03be363
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/README.adoc b/README.adoc
index 6ec60856a1419b28e202b0afd4fcf1baba0b8244..676467aa4cfbe09499994f8232865c24c33666d0 100644 (file)
--- a/README.adoc
+++ b/README.adoc
@@ -221,6 +221,21 @@ As there's no official {lib} Python bindings yet, see
 link:doc/python-howto.txt[`doc/python-howto.txt`] to understand how to
 use them.
 
+== Supported versions
+
+The LTTng project supports the last two released stable versions
+(e.g. stable-2.13 and stable-2.12).
+
+Fixes are backported from the master branch to the last stable version unless
+those fixes would break the ABI or API. Those fixes may be backported to the
+second-last stable version, depending on complexity and ABI/API compatibility.
+
+Security fixes are backported from the master branch to both of the last stable
+version and the second-last stable version.
+
+New features are integrated into the master branch and not backported to the
+last stable branch.
+
 == Community
 
 Mailing list::