diff --git a/src/4_sommerfeld_model.md b/src/4_sommerfeld_model.md
index c7184af274b4e19f514b2b87ca41a85feae983ca..18fa9a6d1051a9add33fbd739376bcf0ccc71690 100644
--- a/src/4_sommerfeld_model.md
+++ b/src/4_sommerfeld_model.md
@@ -302,7 +302,7 @@ A hypothetical metal has a Fermi energy $\epsilon_F = 5.2 \, \mathrm{eV}$ and a
 4. Now, find this difference in energy by calculating the integral found in 1 numerically. Compare your result with 3. 
 
 	??? hint
-		 You can do numerical integration in MATLAB with [`integrate(fun,xmin,xmax)`](https://www.mathworks.com/help/matlab/ref/integral.html).
+		 You can do numerical integration in MATLAB with [`integral(fun,xmin,xmax)`](https://www.mathworks.com/help/matlab/ref/integral.html).
 
 5. Calculate the heat capacity for $T = 1000 \, \mathrm{K}$ in eV/K.
 6. Numerically compute the heat capacity by approximating the derivative of energy difference found in 4 with respect to $T$. To this end, make use of the fact that $$\frac{dy}{dx}=\lim_{\Delta x \to 0} \frac{y(x + \Delta x) - y(x - \Delta x)}{2 \Delta x}.$$ Compare your result with 5.