When I skim back through short journal entries, a lot of ordinary days blur together. I'm tempted to add a tiny label at the top based on whatever made that day stand out, even if it's just the day the bus was mysteriously on time. It feels easier than writing a full recap, and I wouldn't make myself come up with one every day.
A couple of concrete words, like "bus on time," should be easier to scan for later than a broad mood, without making a label feel mandatory every day.