Signs of trouble

I'm really proud of how well my Kindergartener reads.
He's developed a decent vocabulary and is learning how to figure out strange words.
Sometimes, I forget how much he can read.

The other day, we made a trip to the bathroom at church. In the stall, at his eye level, he saw the sign.
And he read it to me.

"Please don't flush the paper towels in the toilet."

What progress we've made.