diff --git a/Sources/Introduction.tex b/Sources/Introduction.tex
index d952f63..c34677c 100644
--- a/Sources/Introduction.tex
+++ b/Sources/Introduction.tex
@@ -101,7 +101,7 @@ If you want to show multiple equations and align them, use the
 \end{align}
 %
 Define new mathematical operators using \verb|\DeclareMathOperator|.
-Some operators are already pre-defined by the template, such the
+Some operators are already pre-defined by the template, such as the
 distance between two objects. Please see the template for some examples. 
 %
 Moreover, this template contains a correct differential operator. Use \verb|\diff| to typeset the differential of integrals: