1 files changed, 1 insertions, 0 deletions
diff --git a/UPGRADING b/UPGRADING
index e2e90adfcb..5863e2e3d0 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -335,6 +335,7 @@ PHP 7.1 UPGRADE NOTES
     now throw an instance of Error instead of resulting in a fatal error
     when a function is called that must generate a session ID.
   . Only CSPRNG is used to generate session ID.
+  . session_regenerate_id() saves old session and start new one.
 
 - SimpleXML:
   . Creating an unnamed or duplicate attribute will throw an instance of Error