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Update setlocale-wsetlocale.md #4479

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1 change: 1 addition & 0 deletions docs/c-runtime-library/reference/setlocale-wsetlocale.md
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Expand Up @@ -38,6 +38,7 @@ Locale specifier.
## Return value

If a valid *`locale`* and *`category`* are given, the functions return a pointer to the string associated with the specified *`locale`* and *`category`*.
If the *`locale`* argument is `NULL`, the functions return the current locale.

If the *`locale`* or *`category`* isn't valid, the invalid parameter handler is invoked, as described in [Parameter validation](../parameter-validation.md). If execution is allowed to continue, each function sets `errno` to `EINVAL`, and returns `NULL`.

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