diff --git a/instructions/exercise_4.tex b/instructions/exercise_4.tex
index 901bbe1bdd95ebfe775e23e82468fc115edb2ea5..5929b24619421cc0fb1bd028c0a18a3adfb3e9c5 100644
--- a/instructions/exercise_4.tex
+++ b/instructions/exercise_4.tex
@@ -241,6 +241,7 @@ in your command line/shell before executing your program.
 		\end{enumerate}
 	\end{enumerate}
 	The resulting $x_n$ is the end approximation of the substep and can afterwards be used as the input for subsequent executions of this subroutine.	 
+	(Consider appropriate conditions to end a loop preliminarily. These may contain: numbers being too small to divide by them, gradients/directional vectors being too short,\ldots)
 	\begin{enumerate}
 		\item In order to structure your code, implement the method \class{ConjugateGradient::CGstep}, which executes one full iteration of the subroutine as detailed above.\\
 		To do that you will need a few extra steps