Installation-instructions.md

@@ -30,7 +30,7 @@ cd /var/local/mkosi
 mkdir mkosi.cache
 # generate image (mkosi command available after source .venv/bin/activate)
 img_name=xcache-$(date +%Y-%m-%d-%H%M)
-mkosi -i -t directory -o /var/lib/machines/$img_name
+mkosi -i -t directory -o /var/lib/machines/$img_name |& tee build_$img_name.log
 ```
 
 **Alternative: Build image using manual `dnf --installroot`**