README: appended anki if not working

README.md

@@ -38,3 +38,13 @@ Inside this directory, `.secrets` folder must be filled with the following:
 vdirsyncer discover
 vdirsyncer sync
 ```
+
+Otherwise, modify `caldav` to your needs.
+
+### Anki not launching
+```bash
+flatpak run --command=bash net.ankiweb.Anki
+[📦 net.ankiweb.Anki ~]$ touch ~/.var/app/net.ankiweb.Anki/data/Anki2/gldriver6
+[📦 net.ankiweb.Anki ~]$ echo software > ~/.var/app/net.ankiweb.Anki/data/Anki2/gldriver6
+[📦 net.ankiweb.Anki ~]$ exit
+```