C routines are indicated by the structured comment /*@ ... @*/. The program bfort uses the name in the first line (Add in this example) to generate the name of the routine for which a wrapper is being provided.
/*@ Add - Add two valuesParameters: . a1,a2 - Values to add @*/ int Add( a1, a2 ) int a1, a2; { return a1 + s2; }