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diff --git a/architecture.mdwn b/architecture.mdwn
index 976d45f..19d8419 100644
--- a/architecture.mdwn
+++ b/architecture.mdwn
@@ -183,6 +183,8 @@ reference in discussions.
# Subplot architecture
```dot
+digraph "arch" {
+
md [label="document source\n(Markdown)"];
md [shape=box];
@@ -210,6 +212,8 @@ impl -> subplot;
subplot -> pdf;
subplot -> testprog;
testprog -> report;
+
+}
```
Subplot reads input files, and produces two outputs.