diff --git a/BRANCHES.md b/BRANCHES.md
index 680c0ca..ba58437 100644
--- a/BRANCHES.md
+++ b/BRANCHES.md
@@ -16,6 +16,9 @@
 also maintain ABI compatibility within LTS branches; see the next section for
 details.
 
+New LTS branches are usually created around the time of a new major version.
+After a new LTS branch is created, it remains supported for at least 3 years.
+
 ## Backwards Compatibility for application code
 
 We maintain API compatibility in released versions of Mbed TLS. If you have