* @index: index into the page cache for @mapping of the page to map
*
* Read a page from the page cache of the address space @mapping at position
- * @index, where @index is in units of PAGE_CACHE_SIZE, and not in bytes.
+ * @index, where @index is in units of PAGE_SIZE, and not in bytes.
*
* If the page is not in memory it is loaded from disk first using the readpage
* method defined in the address space operations of @mapping and the page is