diff --git a/latex/tex/qqgammagamma/calculation.tex b/latex/tex/qqgammagamma/calculation.tex
index 79be548..a39c6ee 100644
--- a/latex/tex/qqgammagamma/calculation.tex
+++ b/latex/tex/qqgammagamma/calculation.tex
@@ -222,7 +222,7 @@ result can also be expressed in terms of the pseudo-rapidity
   \langle\abs{\mathcal{M}}^2\rangle &= p^4\cdot\mathfrak{F}\cdot
   32\cdot\qty[\frac{(1-c)(1+c)}{s'^4}] + \qty[\frac{(1-c)(1+c)}{c'^4}] \\
   &= \frac{4}{3}(gZ)^4 \cdot\frac{1+\cos^2(\theta)}{\sin^2(\theta)} =
-  \frac{4}{3}(gZ)^4\cdot(2\cosh(\eta) - 1)
+  \frac{4}{3}(gZ)^4\cdot(\tanh(\eta)^2 + 1)
   \end{split}
 \end{equation}
 %