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-rw-r--r--chapter09/README.md3
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diff --git a/chapter09/README.md b/chapter09/README.md
index 2090931f..5a04c7f8 100644
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@@ -247,6 +247,9 @@ Without GVN the peepholes cannot see that both sides of the subtraction have the
![Graph3](./docs/09-graph3.svg)
+- Each multiplication(*) node has two edges going to `arg`.
+- In the example above, we fused them to make the graph more readable.
+
With GVN, the peepholes can do a better job:
![Graph4](./docs/09-graph4.svg)