diff --git a/BRANCHES.md b/BRANCHES.md
index a2ea074ab..0ce47e89f 100644
--- a/BRANCHES.md
+++ b/BRANCHES.md
@@ -23,6 +23,9 @@ the API of 3.(x+1) is backward compatible with 3.x). We only break API
 compatibility on major version changes (e.g. from 3.x to 4.0). We 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