diff --git a/semester2/algorithms-and-probability/aw-summary.pdf b/semester2/algorithms-and-probability/aw-summary.pdf
index b3c825b..880c124 100644
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diff --git a/semester2/algorithms-and-probability/parts/combinatorics.tex b/semester2/algorithms-and-probability/parts/combinatorics.tex
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--- a/semester2/algorithms-and-probability/parts/combinatorics.tex
+++ b/semester2/algorithms-and-probability/parts/combinatorics.tex
@@ -1,6 +1,8 @@
 \newsection
 \section{Combinatorics}
 \subsection{Introduction}
+Please note: This section was not part of the book and is written in very simple terms (it is taken from a summary I wrote 4 years ago during Gymnasium)
+
 Combinatorics was developed from the willingness of humans to gamble and the fact that everybody wanted to win as much money as possible.
 
 \subsection{Simple counting operations}