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diff --git a/passes/pmgen/README.md b/passes/pmgen/README.md
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@@ -315,6 +315,9 @@ state variables used to pass arguments.
Subpatterns cann be called recursively.
+If a `subpattern` statement is preceded by a `fallthrough` statement, this is
+equivalent to calling the subpattern at the end of the preceding block.
+
Generate Blocks
---------------