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@@ -211,6 +211,19 @@ To enable the swap you can use for example:
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```
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You can make a permanent swap file following this [tutorial](https://www.digitalocean.com/community/tutorials/how-to-add-swap-on-ubuntu-14-04).
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+## proc_open(): failed to open stream errors (Windows)
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+
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+If composer shows proc_open(NUL) errors on Windows:
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+
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+`proc_open(NUL): failed to open stream: No such file or directory`
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+
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+This could be happening because you are working in a _OneDrive_ directory and
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+using a version of PHP that does not support the file system semantics of this
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+service. The issue was fixed in PHP 7.2.23 and 7.3.10.
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+
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+Alternatively it could be because the Windows Null Service is not enabled. For
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+more information, see this [issue](https://github.com/composer/composer/issues/7186#issuecomment-373134916).
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+
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## Degraded Mode
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Due to some intermittent issues on Travis and other systems, we introduced a
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