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diff --git a/README.md b/README.md
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 # nextpnr-tests
 
 This repo is intended for use as a submodule from YosysHQ/nextpnr
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+Initial contents were populated from [YosysHQ/nextpnr@6cc1bf](https://github.com/YosysHQ/nextpnr/commit/6cc1bfcb37199e0988d0f06ce34071b409ab8019)