diff --git a/exercise7/Makefile b/exercise7/Makefile
index b14a03b..2b84a8c 100644
--- a/exercise7/Makefile
+++ b/exercise7/Makefile
@@ -27,6 +27,8 @@ compare/%: data
 	python3 compare.py data_sequential/$(shell printf "%05d" $*).dat data/$(shell printf "%05d" $*).dat
 diff/%: data
 	python3 plot_differences.py data_sequential/$(shell printf "%05d" $*).dat data/$(shell printf "%05d" $*).dat
+show/%: diff/%
+	feh difference_plot.png
 check: compare/0 compare/75
 clean:
 	-rm -fr sequential parallel data images wave.mp4