* Reads the header from a WIM file.
*
* @wim
- * WIM to read the header from; @wim->in_fd must be positioned at the
- * offset at which to read the header.
+ * WIM to read the header from. @wim->in_fd must be positioned at the
+ * beginning of the file.
*
* @hdr
* Structure to read the header into.