diff --git a/bib.bib b/bib.bib
index 2984400..ebf7a98 100644
--- a/bib.bib
+++ b/bib.bib
@@ -156,5 +156,23 @@ year = {2006}
     year = {2004},
     url = {http://designersnotebook.com/Columns/063_Postmodernism/063_postmodernism.htm}
 }
+@article{CANKAYA_2019,
+    author = {Çankaya, Serkan},
+    year = {2019},
+    month = {01},
+    pages = {74-88},
+    title = {Use of VR Headsets in Education: A Systematic Review Study},
+    journal = {Journal of Educational Technology and Online Learning},
+    doi = {10.31681/jetol.518275}
+}
+
+@misc{MARTINDALE_2017,
+    note = {letzer Zugriff 7.1.2022},
+    year = {2017},
+    author = {Jon Martindale },
+    url = {https://www.digitaltrends.com/virtual-reality/playstationvr-outsells-htc-vive-oculus-rift/},
+    title = {PlayStation VR dominates third-quarter VR headset sales },
+}
+
 
 
diff --git a/pics/vr_headset_manufacturer_marketshare.png b/pics/vr_headset_manufacturer_marketshare.png
new file mode 100644
index 0000000..90b03ae
Binary files /dev/null and b/pics/vr_headset_manufacturer_marketshare.png differ
diff --git a/sections/technologies.tex b/sections/technologies.tex
index 04f76d7..17dd763 100644
--- a/sections/technologies.tex
+++ b/sections/technologies.tex
@@ -2,6 +2,19 @@
 
 \subsection{VR Headset}\label{sec:vr-headset}
 
+VR Headsets gibt es auf dem Markt schon viele.
+Nach einer Statistik in 2017 sind die beliebtesten VR Headset Hersteller Sony, Oculus und HTC (Siehe~\ref{fig:vr_headset_manufacturer_marketshare}\cite{MARTINDALE_2017} gefunden in~\cite{CANKAYA_2019}).
+
+\begin{figure}
+    \includegraphics[scale=0.5]{pics/vr_headset_manufacturer_marketshare}
+    \caption{Marketshare VR Headset Hersteller}
+    \label{fig:vr_headset_manufacturer_marketshare}
+\end{figure}
+
+\subsubsection{HTC Vive Pro}
+
+Die HTC Vive Pro
+
 \subsection{VR Controller}\label{sec:vr-controller}
 
 \subsection{Tracker}\label{sec:tracker}