Update comment in mpi_sub_hlp
@@ -1328,7 +1328,8 @@ cleanup:
}
/*
- * Helper for mbedtls_mpi subtraction
+ * Helper for mbedtls_mpi subtraction.
+ * This function assumes that X->n >= A->n.
*/
static void mpi_sub_hlp( const mbedtls_mpi *X, const mbedtls_mpi *A, const mbedtls_mpi *B )
{
