diff --git a/common/images/Makefile b/common/images/Makefile
index 7c0aadc..868e5b8 100644
--- a/common/images/Makefile
+++ b/common/images/Makefile
@@ -1,33 +1,36 @@
 GEN_STUFF =
 GEN_STUFF += PreservationPyramid.pdf
 GEN_STUFF += swh-dataflow.svg
 GEN_STUFF += swh-dataflow.pdf
 
 all: $(GEN_STUFF)
 
 support.pdf: support.odg
 	soffice --headless --convert-to pdf support.odg "-env:UserInstallation=file:///tmp/LibreOffice_Conversion_${USER}"
 	# incredible libreoffice bug, see http://stackoverflow.com/questions/30349542/command-libreoffice-headless-convert-to-pdf-test-docx-outdir-pdf-is-not
 	pdfcrop support.pdf
 	mv support-crop.pdf support.pdf 
 
 sponsors.pdf: sponsors.odg
 	soffice --headless --convert-to pdf sponsors.odg "-env:UserInstallation=file:///tmp/LibreOffice_Conversion_${USER}"
 	# incredible libreoffice bug, see http://stackoverflow.com/questions/30349542/command-libreoffice-headless-convert-to-pdf-test-docx-outdir-pdf-is-not
 	pdfcrop sponsors.pdf
 	mv sponsors-crop.pdf sponsors.pdf 
 
 %.svg: %.dia
 	dia -t svg -e $@ $<
 
 %.pdf: %.svg
 	inkscape --export-area-drawing --export-pdf $@ $<
 
+swh-dataflow-merkle-listers.pdf: swh-dataflow-merkle.dia
+	dia -t pdf -L Background -e $@ $<
+
 PreservationPyramid.pdf: PreservationPyramid.tex
 	pdflatex PreservationPyramid.tex
 	pdfcrop PreservationPyramid.pdf
 	mv PreservationPyramid-crop.pdf PreservationPyramid.pdf
 
 clean:
 	rm -f *.aux *.toc *.log *.snm *.nav *~
 
diff --git a/common/images/swh-dataflow-merkle.dia b/common/images/swh-dataflow-merkle.dia
new file mode 100644
index 0000000..0eb4902
Binary files /dev/null and b/common/images/swh-dataflow-merkle.dia differ