When Apple launched iTunes Match a few years ago it has a limit of 25,000 music tracks that could be matched from your iTunes library and them streamed from the cloud to your Apple devices.
Apple has now increased the amount of tracks that can be matched in iTunes Match from 25,000 to 100,000.
When iOS 9 was released back in September, Apple said that they would increase the limit of supported tracks to 100,000, although this has only just been rolled out over the last few days. As well as iTunes Match, Apple Music now has the same 100,000 track limit.
Apple is still showing the 25,000 track limit on their support page, although the limit has now been increased to 100,000, this does not include tracks that you have purchased from iTunes, the limit only applies to tracks you have added to your library.
Source MacRumors