One of these is the fact that Charlie can’t read.

While volunteering at Abbott Elementary, Charlie initially gets assigned to Jacob’s (Chris Perfetti) classroom.

Melissa approaches this without judgment and initially suggests that Charlie might have dyslexia like she does.

Charlie Day, Jacob Perfetti, Sheryl Lee Ralph, and Lisa Ann Walter in the library

Image via ABC

With the help of Barbara, Melissa, and Jacob,Charlie finally learns how to read.

It’s always sunny at Abbott.

Thanks to theAbbott Elementaryteachers, Charlie finally learns to read in under a week.

Barbara Howard and Charlie Kelly having a conversation in the crossover episode between Abbott Elementary and It’s Always Sunny in Philadelphia

Image via ABC

BothAbbott ElementaryandIt’s Always Sunny in Philadelphiaare available to stream on Hulu.

The Cast of It’s Always Sunny and Abbot Elementary

Abbott Elementary Season 3 TV Series Poster

A workplace comedy centered around a group of dedicated teachers - and an oblivious principal - in a Philadelphia public school where, despite the odds stacked against them, they are determined to help their students succeed in life.

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It’s Always Sunny in Philadelphia

Abbott Elementary