Enthalpy in Ladybug_Humidity Ratio Calculator

I would like to know if anyone knows the formula for enthalpy in the Ladybug_Humidity Ratio Calculator, as it is written in Python and I can’t read the program to see which formula it refers to.

Thank you

You might want to ask this in the ladybug forum:

Thank you.
But, my ladybug acount is on hold, so i couldnt post it on ladybug form and i posted it here.