Apple has released updates to Pages, Numbers and Keynote for compatibility with the new iCloud Documents features in Mountain Lion and the corresponding Mac OS X updates released yesterday. The three apps, now at version 1.6.1, simply now list that they work with iCloud to make documents, spreadsheets and presentations automatically available between iOS devices and the corresponding Mac OS X applications, with changes made on one device now being “instantly available” on the other. The three iWork apps for iOS were originally updated to add iCloud support last fall with the initial debut of iCloud in iOS 5, allowing users to share documents, spreadsheets and presentations between multiple iOS devices. However, iCloud support did not come to iWork for the Mac until yesterday’s release of OS X Mountain Lion; these latest iOS updates appear to be primarily focused on ensuring compatibility with iCloud on the Mac. Pages, Numbers and Keynote 1.6.1 are universal apps and require iOS 5.1 or later. Each is sold separately from the App Store for $10.