1 files changed, 3 insertions, 2 deletions

diff --git a/src/lib/libcrypto/doc/DSA_set_method.pod b/src/lib/libcrypto/doc/DSA_set_method.pod
index 0b13ec9237..edec46413d 100644
--- a/src/lib/libcrypto/doc/DSA_set_method.pod
+++ b/src/lib/libcrypto/doc/DSA_set_method.pod
@@ -62,12 +62,13 @@ struct
         int (*dsa_do_verify)(const unsigned char *dgst, int dgst_len,
                                  DSA_SIG *sig, DSA *dsa);
 
-     /* compute rr = a1^p1 * a2^p2 mod m. May be NULL */
+     /* compute rr = a1^p1 * a2^p2 mod m (May be NULL for some
+                                          implementations) */
         int (*dsa_mod_exp)(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
                                  BIGNUM *a2, BIGNUM *p2, BIGNUM *m,
                                  BN_CTX *ctx, BN_MONT_CTX *in_mont);
 
-     /* compute r = a ^ p mod m. May be NULL */
+     /* compute r = a ^ p mod m (May be NULL for some implementations) */
         int (*bn_mod_exp)(DSA *dsa, BIGNUM *r, BIGNUM *a,
                                  const BIGNUM *p, const BIGNUM *m,
                                  BN_CTX *ctx, BN_MONT_CTX *m_ctx);