diff --git a/5-tensors.tex b/5-tensors.tex
index 27b01a5..fe9567e 100644
--- a/5-tensors.tex
+++ b/5-tensors.tex
@@ -454,9 +454,9 @@ \section{Tensor bundles}
 \end{example}
 
 \begin{exercise}[\textit{[homework 3]}]
-  Let $F:N\to P$ and $G:M\to N$ two diffeomorphisms of smooth manifolds.
+  Let $F:M\to N$ and $G:N\to P$ two diffeomorphisms of smooth manifolds.
   \begin{enumerate}
-    \item Show that the chain rule $(F\circ G)_* = F_* \circ G_*$ holds.
+    \item Show that the chain rule $(G\circ F)_* = G_* \circ F_*$ holds.
     \item Show that our previous definition\footnote{That is, Definition~\ref{def:pullback0s} -- which includes the pullback from Definition~\ref{def:pullback1f}.} of pullback is a particular case of the following general definition of a \emph{pullback of $(r,s)$-tensor fields by $F$}:
     \begin{equation}
       F^* := (F^{-1})_* : \cT_s^r(N) \to \cT_s^r(M).