diff --git a/lib/fonts/test/check_glyphs.lyx b/lib/fonts/test/check_glyphs.lyx
index f32ef31875..b4d5c5f5df 100644
--- a/lib/fonts/test/check_glyphs.lyx
+++ b/lib/fonts/test/check_glyphs.lyx
@@ -1,5 +1,5 @@
 #LyX 2.4 created this file. For more info see https://www.lyx.org/
-\lyxformat 598
+\lyxformat 610
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -83,6 +83,7 @@
 \html_css_as_file 0
 \html_be_strict false
 \docbook_table_output 0
+\docbook_mathml_prefix 1
 \end_header
 
 \begin_body
@@ -562,8 +563,9 @@ This file contains each symbol of the font stmary10.ttf that is made accessible
 \end_layout
 
 \begin_layout Standard
-The critical codepoints (9,10,12,13) for qt4/qt5 transition (compare mathed
- and instant preview result):
+The codepoints (9,10,12,13) are not displayed correctly by Qt.
+ We work around this by duplicating the glyphs on our TeX fonts.
+ (compare mathed and instant preview result):
 \end_layout
 
 \begin_layout Standard