diff --git a/meeting-notes/20190613.md b/meeting-notes/20190613.md
index 975c273f0e93a3c6cef81dc5be4c73d449bab954..fdf46d3775f90cb127eaa5b6f55fa37f90ad2fdc 100644
--- a/meeting-notes/20190613.md
+++ b/meeting-notes/20190613.md
@@ -13,6 +13,7 @@
 ## Notes
 
 * focus on the 3 questions and the data we already have! *Don't* start anything new!
+* framing question: why does filter legacy system still exist in times of fancier machine learning tools?
 
 
 ## TODO
diff --git a/thesis/2-Background.tex b/thesis/2-Background.tex
index f9f687a3305f006ea3b023815765de975d91a640..c2ae06da2ef5cf4452ebc3a7a68d09c04f9359c5 100644
--- a/thesis/2-Background.tex
+++ b/thesis/2-Background.tex
@@ -19,6 +19,7 @@ There is one mechanism though that is very ostentatiously missing from all these
   \includegraphics[width=0.9\columnwidth]{pics/funnel-diagramm-no-filters.JPG}
   \caption{State of the scientific literature: edit filters are missing from the quality control frame}~\label{fig:funnel-no-filters}
 \end{figure}
+%TODO merge with rise and decline graphic from~\cite{HalGeiMorRied2013}
 
 At first, scientific studies on Wikipedia largely ignored algorithmic quality control mechanisms.
 Their contribution to the encyclopedia and therefore their impact were considered insignificant. %quote?
diff --git a/thesis/references.bib b/thesis/references.bib
index 205cd1d6bbdde8d26e250241b94ac99746a7171f..c0c6edee7db0f310ef14daa195c53b785e9198d1 100644
--- a/thesis/references.bib
+++ b/thesis/references.bib
@@ -116,6 +116,17 @@
   note =         {\url{https://github.com/lusy/wikifilters}}
 }
 
+@article{HalGeiMorRied2013,
+  title = {The rise and decline of an open collaboration system: How Wikipedia’s reaction to popularity is causing its decline},
+  author = {Halfaker, Aaron and Geiger, R Stuart and Morgan, Jonathan T and Riedl, John},
+  journal = {American Behavioral Scientist},
+  volume = {57},
+  number = {5},
+  pages = {664--688},
+  year = {2013},
+  publisher = {Sage Publications Sage CA: Los Angeles, CA}
+}
+
 @article{HalGeiMorSarWig2018,
   title = {ORES: Facilitating re-mediation of Wikipedia’s socio-technical problems},
   author = {Halfaker, Aaron and Geiger, R Stuart and Morgan, Jonathan T and Sarabadani, Amir and Wight, Adam},