note legacy version files in core setup guide

as suggested in #499
asdf-vm · Mar 25, 2019 · a43d9b4 · a43d9b4
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diff --git a/docs/core-manage-asdf-vm.md b/docs/core-manage-asdf-vm.md
@@ -141,6 +141,8 @@ sudo dnf install \
 
 That's all! You are ready to use asdf 🎉
 
+?> If you're migrating from other tools and want to use your existing `.node-version` or `.ruby-version` version files, look at the [`legacy_verison_file` flag in the configuration section](core-configuration?id=homeasdfrc).
+
 ## Update
 
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