diff --git a/regression/lecture/regression-chapter.tex b/regression/lecture/regression-chapter.tex
index 73155b4..7640387 100644
--- a/regression/lecture/regression-chapter.tex
+++ b/regression/lecture/regression-chapter.tex
@@ -31,7 +31,7 @@ Fit with matlab functions lsqcurvefit, polyfit
 \item You need got initial values for the parameter!
 \item Example that fitting gets harder the more parameter yuo have.
 \item Try to fix as many parameter before doing the fit.
-\item How to test the quality of a fit? Residuals. $\Chi^2$ test. Run-test.
+\item How to test the quality of a fit? Residuals. $\chi^2$ test. Run-test.
 \end{itemize}
 
 \subsection{Linear fits}