diff --git a/development/FORMAT b/development/FORMAT
index 50ddc45e16..4391a4881d 100644
--- a/development/FORMAT
+++ b/development/FORMAT
@@ -7,6 +7,9 @@ changes happened in particular if possible. A good example would be
 
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+2021-03-23 Thibaut Cuvelier <tcuvelier@lyx.org> 
+ 	* Format incremented to 608: DocBook MathML-namespace prefix.
+
 2021-01-28 Jürgen Spitzmüller <spitz@lyx.org>
  	* Format incremented to 606: Support KOMA \frontispiece.