diff --git a/Lectures/L13_ModularDesign/ModularDesign.tex b/Lectures/L13_ModularDesign/ModularDesign.tex
index 7c2c4123c6e33d47380917ad8e27a1013e8643ef..6bc856d46ff225b6b0f841a90172acbfef1b7203 100755
--- a/Lectures/L13_ModularDesign/ModularDesign.tex
+++ b/Lectures/L13_ModularDesign/ModularDesign.tex
@@ -1142,7 +1142,7 @@ AC2 & M2\\
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 \begin{frame}
-\frametitle{Object Oriented Design Versus Modular Desiogn}
+\frametitle{Object Oriented Design Versus Modular Design}
 \begin{itemize}
 \item OO-design and OO-languages are different
 \item OO-design