Alabama became the 43rd state to allow charter schools when Republican Gov. Bentley signed legislation on Thursday.

Unfortunately, the law only allows 10 charter schools to operate. The Center for Education Reform, which grades charter laws in every state, says Alabama’s charter law would earn a “mediocre grade.” Maine has a similarly severe cap on the number of charter schools and its charter laws received a “C” grade from the organization, although other factors affect grading, such as school autonomy.