I noticed that a few hiking paths in the south of bologna were missing on OSM. They are marked as "CAI <number>" trails with red/white trail marks. 
https://forum.openstreetmap.org/viewtopic.php?id=56087

I added notes with the CAI numbers where I saw them on the way but was missing them on OSM.

So this note was meant to say: CAI 112a is marked here.