Note that these bindings are at an early stage and have only been used minimally. The interface may change. Comments and bug reports are welcome through the github page.
Documentation is here, it can be generated with dune build @doc, (or ./make_doc.sh) but the binding follows the SDL2_ttf interface closely, so it may be sufficient to consult its documentation.
WARNING V0.3 Breaking change
Starting from 0.3, the library name is the same as the opam package name tsdl-ttf. (The library name used to be tsdl_ttf, which was confusing).