diff --git a/lib/doc/Math.lyx b/lib/doc/Math.lyx
index 90ffecda2d..81c1f82d10 100644
--- a/lib/doc/Math.lyx
+++ b/lib/doc/Math.lyx
@@ -1301,29 +1301,6 @@ mu =
 
 \InsetSpace \thinspace{}
 em)
-\begin_inset Note Note
-status collapsed
-
-\begin_layout Standard
-The command 
-\series bold
-
-\backslash
-textfrac
-\series default
- is explained in sec.\InsetSpace \thinspace{}
-
-\begin_inset LatexCommand ref
-reference "sub:Self-defined-Fractions"
-
-\end_inset
-
-.
-\end_layout
-
-\end_inset
-
-
 \end_layout
 
 \end_inset
diff --git a/lib/doc/de/Math.lyx b/lib/doc/de/Math.lyx
index ff37464896..89f80d8824 100644
--- a/lib/doc/de/Math.lyx
+++ b/lib/doc/de/Math.lyx
@@ -1306,29 +1306,6 @@ mu =
 
 \InsetSpace \thinspace{}
 em)
-\begin_inset Note Note
-status collapsed
-
-\begin_layout Standard
-Der Befehl 
-\series bold
-
-\backslash
-textfrac
-\series default
- ist in Kap.
- 
-\begin_inset LatexCommand ref
-reference "sub:Selbstdefinierte-Brüche"
-
-\end_inset
-
- erklärt.
-\end_layout
-
-\end_inset
-
-
 \end_layout
 
 \end_inset
diff --git a/lib/doc/es/Math.lyx b/lib/doc/es/Math.lyx
index 0ccc9908c7..1be397b9d6 100644
--- a/lib/doc/es/Math.lyx
+++ b/lib/doc/es/Math.lyx
@@ -1272,29 +1272,6 @@ mu =
 
 \InsetSpace \thinspace{}
 em)
-\begin_inset Note Note
-status collapsed
-
-\begin_layout Standard
-El comando 
-\series bold
-
-\backslash
-textfrac
-\series default
- se explica en la sec.\InsetSpace \thinspace{}
-
-\begin_inset LatexCommand ref
-reference "sub:Fracciones-auto-definidas"
-
-\end_inset
-
-.
-\end_layout
-
-\end_inset
-
-
 \end_layout
 
 \end_inset
diff --git a/lib/doc/fr/Math.lyx b/lib/doc/fr/Math.lyx
index 41d12d4b8c..edb00120bc 100644
--- a/lib/doc/fr/Math.lyx
+++ b/lib/doc/fr/Math.lyx
@@ -1276,31 +1276,6 @@ mu =
 
 \InsetSpace \thinspace{}
 em)
-\begin_inset Note Note
-status collapsed
-
-\begin_layout Standard
-La commande 
-\series bold
-
-\backslash
-textfrac
-\series default
- est expliquée sec.\InsetSpace \thinspace{}
-
-\begin_inset LatexCommand ref
-reference "sub:Fractions-personnalisées"
-
-\end_inset
-
-
-\lang english
-.
-\end_layout
-
-\end_inset
-
-
 \end_layout
 
 \end_inset