diff --git a/include/openssl/ec_key.h b/include/openssl/ec_key.h
index 3a40856..502bfc2 100644
--- a/include/openssl/ec_key.h
+++ b/include/openssl/ec_key.h
@@ -167,8 +167,9 @@
 // about the problem can be found on the error stack.
 OPENSSL_EXPORT int EC_KEY_check_key(const EC_KEY *key);
 
-// EC_KEY_check_fips performs a signing pairwise consistency test (FIPS 140-2
-// 4.9.2). It returns one if it passes and zero otherwise.
+// EC_KEY_check_fips performs both a signing pairwise consistency test
+// (FIPS 140-2 4.9.2) and the consistency test from SP 800-56Ar3 section
+// 5.6.2.1.4. It returns one if it passes and zero otherwise.
 OPENSSL_EXPORT int EC_KEY_check_fips(const EC_KEY *key);
 
 // EC_KEY_set_public_key_affine_coordinates sets the public key in |key| to
@@ -194,7 +195,9 @@
 OPENSSL_EXPORT int EC_KEY_generate_key(EC_KEY *key);
 
 // EC_KEY_generate_key_fips behaves like |EC_KEY_generate_key| but performs
-// additional checks for FIPS compliance.
+// additional checks for FIPS compliance. This function is applicable when
+// generating keys for either signing/verification or key agreement because
+// both types of consistency check (PCT) are performed.
 OPENSSL_EXPORT int EC_KEY_generate_key_fips(EC_KEY *key);
 
 // EC_KEY_derive_from_secret deterministically derives a private key for |group|