-BN_RECP_CTX_set() computes 1/B<m> and shifts it left by
-BN_num_bits(B<m>)+1 to make it an integer. The result and the
-number of bits it was shifted left are stored in B<recp>.
+BN_RECP_CTX_set() stores B<m> in B<recp> and sets it up for computing
+1/B<m> and shifting it left by BN_num_bits(B<m>)+1 to make it an
+integer. The result and the number of bits it was shifted left will
+later be stored in B<recp>.
+
+BN_div_recp() divides B<a> by B<m> using B<recp>. It places the quotient
+in B<dv> and the remainder in B<rem>.