diff --git a/10.brainstorming-innovative-courses/intercambio-curso-electromagnetismo/textbook.en.md b/10.brainstorming-innovative-courses/intercambio-curso-electromagnetismo/textbook.en.md
index b2354afcb..6e095d7c5 100644
--- a/10.brainstorming-innovative-courses/intercambio-curso-electromagnetismo/textbook.en.md
+++ b/10.brainstorming-innovative-courses/intercambio-curso-electromagnetismo/textbook.en.md
@@ -687,7 +687,7 @@ $`\overrightarrow{rot}\,\overrightarrow{B}=\mu_0 \cdot \overrightarrow{j}\,+ \,
 #### Ecuaciones de Maxwell en forma integral / Equations de maxwell intégrales / ...
 
 
-$`\displaystyle\oiint_S\overrightarrow{E}\cdot\overrightarrow{dS}=\dfrac{Q_{int}}{\epsilon_0}`$$`=\dfrac{1}{\epsilon_0} \cdot \iiint_{\tau \leftrightarrow S} \rho \cdot d\tau`$
+$`\displaystyle\oiint_S\overrightarrow{E}\cdot\overrightarrow{dS}=\dfrac{Q_{int}}{\epsilon_0}`$$`=\dfrac{1}{\epsilon_0} \cdot \displaystyle\iiint_{\big\tau \leftrightarrow S} \rho \cdot d\tau`$
 
 
 $`\displaystyle\oiint_S\overrightarrow{B}\cdot\overrightarrow{dS}=0`$