I found a small typo in the documentation for the r6rs conditions library in both the 2.0 and 2.1 series. Ordinarily, this would be small enough to not be worth going to the trouble to fix, but since it is in the library name, it could cause someone trying to import the library a lot of trouble to figure out what is wrong and why the library can't be found (just fought with it myself for quite a while).
The typo is in the first sentence in the library name. It says "(rnrs condition (6))" which is missing the 's' in "conditions". An 's' needs to be added to make it "(rnrs conditions (6))" Freja Nordsiek
