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diff --git a/vendor/doctrine/persistence/CONTRIBUTING.md b/vendor/doctrine/persistence/CONTRIBUTING.md
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+# Circular dependency
+
+This package has a development dependency on `doctrine/common`, which has a
+regular dependency on this package (`^2.0` at the time of writing).
+
+To be able to use Composer, one has to let it understand that this is version 2
+(even when developing on 3.0.x), as follows:
+
+```shell
+COMPOSER_ROOT_VERSION=2.0 composer update -v
+```