diff --git a/doc/versions.json b/doc/versions.json
index a56c8224e6f1..d7cf796767d1 100644
--- a/doc/versions.json
+++ b/doc/versions.json
@@ -1,5 +1,6 @@
 [
     "2.6.99",
+    "2.6.99-cs2",
     "2.6.99-cs1",
     "2.6.1",
     "2.6.0",