diff --git a/lib/doc/Math.lyx b/lib/doc/Math.lyx
index 99d0392930..8ca97d5343 100644
--- a/lib/doc/Math.lyx
+++ b/lib/doc/Math.lyx
@@ -212,6 +212,7 @@
 \html_math_output 0
 \html_css_as_file 0
 \html_be_strict false
+\author -1174727462 "Kornel Benko" Kornel.Benko@berlin.de
 \author 2047637253 "Guillaume Munch"
 \end_header
 
@@ -1173,7 +1174,11 @@ pt)
 \begin_inset Text
 
 \begin_layout Plain Layout
-böp
+b
+\change_deleted -1174727462 1449863719
+ö
+\change_unchanged
+p
 \end_layout
 
 \end_inset