diff --git a/lib/doc/Additional.lyx b/lib/doc/Additional.lyx
index 39cb81e5e3..1d0024f3b7 100644
--- a/lib/doc/Additional.lyx
+++ b/lib/doc/Additional.lyx
@@ -18955,7 +18955,7 @@ Version
 Control
 \family default
  submenu.
- LyX was tested against RCS 5.7.
+ LyX was tested against RCS 5.7/5.8.
 \end_layout
 
 \begin_layout Subsubsection