Github user vasia commented on a diff in the pull request:
https://github.com/apache/flink/pull/818#discussion_r32374703
--- Diff: docs/libs/gelly_guide.md ---
@@ -240,6 +240,7 @@ Graph<Long, Double, Double> networkWithWeights =
network.joinWithEdgesOnSource(v
<img alt="Union Transformation" width="50%" src="fig/gelly-union.png"/>
</p>
+* <strong>Difference</strong>: Gelly's `difference()` method performs a
difference on the vertex and edge sets of the input graphs. The resultant graph
is formed by removing the vertices and edges from the graph that are common
with the second graph.
--- End diff --
we can rephrase this a bit.. there is one input graph and no "second"
graph... I guess you copied from the union description above (which should also
be changed).
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