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@@ -292,6 +292,12 @@ The `overlay` is a very fast union filesystem. It is now merged in the main
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Linux kernel as of [3.18.0](https://lkml.org/lkml/2014/10/26/137). Call
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`docker -d -s overlay` to use it.
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+> **Note:**
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+> As promising as `overlay` is, the feature is still quite young and should not
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+> be used in production. Most notably, using `overlay` can cause excessive
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+> inode consumption (especially as the number of images grows), as well as
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+> being incompatible with the use of RPMs.
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+
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> **Note:**
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> It is currently unsupported on `btrfs` or any Copy on Write filesystem
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> and should only be used over `ext4` partitions.
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