diff --git a/doc/images/jkqtmathtext/jkqtmathtext_doc_quadraticeq.png b/doc/images/jkqtmathtext/jkqtmathtext_doc_quadraticeq.png
index cbe351011b..45ef6679c1 100644
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index eaa2aef9f5..9de92504bc 100644
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diff --git a/doc/images/jkqtmathtext/jkqtmathtext_utf8.png b/doc/images/jkqtmathtext/jkqtmathtext_utf8.png
index 342f14b3d1..59d040436a 100644
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diff --git a/doc/jkqtmathtext_docimages_math.jkmt b/doc/jkqtmathtext_docimages_math.jkmt
index 8767af4643..2b1092324c 100644
--- a/doc/jkqtmathtext_docimages_math.jkmt
+++ b/doc/jkqtmathtext_docimages_math.jkmt
@@ -12,11 +12,11 @@ jkqtmathtext_specialsubsuper.png
 $\lim\limits_{x\rightarrow\infty}\sum\limits_{n=1}^\infty\prod\limits_{n=1}^\infty\bigvee\limits_{n=1}^\infty\bigcup\limits_{n=1}^\infty$
 ---
 jkqtmathtext_doc_quadraticeq.png
-$x_{1/2]=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$
+$x_{1/2}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$
 ---
 jkqtmathtext_doc_quadraticeq_boxes.png
 --showboxes
-$x_{1/2]=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$
+$x_{1/2}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$
 ---
 jkqtmathtext_lsubstack.png
 {\backslash}lsubstack: $\sum\limits_\lsubstack{0\leq i\leq10\\-5\leq j\leq1000}f_{i,j}$