diff --git a/lib/doc/Math.lyx b/lib/doc/Math.lyx
index e60a9606c7..7e65db6fdc 100644
--- a/lib/doc/Math.lyx
+++ b/lib/doc/Math.lyx
@@ -34254,7 +34254,7 @@ One can also use standard commands known to CAS:
 \begin_layout Itemize
 
 \change_inserted 5863208 1465782942
-\begin_inset Formula $powerseries\left(-\log\left(5-x\right),x,1\right)=\sum_{{\it i_{1}}=0}^{\infty}{\frac{4^{-{\it i_{1}}-1}\,\left(x-1\right)^{{\it i_{1}}+1}}{{\it i_{1}}+1}}-\log\left(-1\right)$
+\begin_inset Formula $powerseries\left(-\log\left(5-x\right),x,1\right)=\sum_{{\mathit i_{2}}=0}^{\infty}{\frac{4^{-{\mathit i_{2}}-1}\,\left(x-1\right)^{{\mathit i_{2}}+1}}{{\mathit i_{2}}+1}}-\log4$
 \end_inset