gost3410/curve.go       | 2 ++
 gost3410/private.go     | 7 +++++--
 gost3410/public.go      | 6 ++++--
 gost3410/ukm.go         | 1 +
 gost34112012256/hash.go | 2 +-
 gost34112012512/hash.go | 2 +-

diff --git a/gost3410/curve.go b/gost3410/curve.go
index 8dd656fcc8828a02253abf92822c89ed4e6768a185956ac619de772dd122e242..0bffe8ae0054efc36614dae7948452d2f09a16c6dfb158001700751d90244dc6 100644
--- a/gost3410/curve.go
+++ b/gost3410/curve.go
@@ -88,6 +88,8 @@ 	}
 	return &c, nil
 }
 
+// Get the size of the point's coordinate in bytes.
+// 32 for 256-bit curves, 64 for 512-bit ones.
 func (c *Curve) PointSize() int {
 	return pointSize(c.P)
 }
diff --git a/gost3410/private.go b/gost3410/private.go
index d14310be8f5080e749b0902733b5cd04aa151b48d119c1765c538bfafc253643..6494308748868e55206c554051ea20c0b477e8bfd9ba103887d43305abd8671b 100644
--- a/gost3410/private.go
+++ b/gost3410/private.go
@@ -28,6 +28,7 @@ 	C   *Curve
 	Key *big.Int
 }
 
+// Unmarshal little-endian private key. "raw" must be c.PointSize() length.
 func NewPrivateKey(c *Curve, raw []byte) (*PrivateKey, error) {
 	pointSize := c.PointSize()
 	if len(raw) != pointSize {
@@ -52,8 +53,9 @@ 	}
 	return NewPrivateKey(c, raw)
 }
 
-func (prv *PrivateKey) Raw() []byte {
-	raw := pad(prv.Key.Bytes(), prv.C.PointSize())
+// Marshal little-endian private key. raw will be prv.C.PointSize() length.
+func (prv *PrivateKey) Raw() (raw []byte) {
+	raw = pad(prv.Key.Bytes(), prv.C.PointSize())
 	reverse(raw)
 	return raw
 }
@@ -109,6 +111,7 @@ 		pad(r.Bytes(), pointSize)...,
 	), nil
 }
 
+// Sign the digest. opts argument is unused.
 func (prv *PrivateKey) Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) ([]byte, error) {
 	return prv.SignDigest(digest, rand)
 }
diff --git a/gost3410/public.go b/gost3410/public.go
index 1f02065590ce1fff9cb3aec473a3236825b17ae9d318bcbc1d3b9f037c260cce..2650208952213b91be58f199d83ebbe6805982d5c8dd37b3311b8b4b8172d1e9 100644
--- a/gost3410/public.go
+++ b/gost3410/public.go
@@ -27,6 +27,7 @@ 	X *big.Int
 	Y *big.Int
 }
 
+// Unmarshal LE(X)||LE(Y) public key. "raw" must be 2*c.PointSize() length.
 func NewPublicKey(c *Curve, raw []byte) (*PublicKey, error) {
 	pointSize := c.PointSize()
 	key := make([]byte, 2*pointSize)
@@ -43,9 +44,10 @@ 		bytes2big(key[:pointSize]),
 	}, nil
 }
 
-func (pub *PublicKey) Raw() []byte {
+// Marshal LE(X)||LE(Y) public key. raw will be 2*pub.C.PointSize() length.
+func (pub *PublicKey) Raw() (raw []byte) {
 	pointSize := pub.C.PointSize()
-	raw := append(
+	raw = append(
 		pad(pub.Y.Bytes(), pointSize),
 		pad(pub.X.Bytes(), pointSize)...,
 	)
diff --git a/gost3410/ukm.go b/gost3410/ukm.go
index a031f52544a13616dfe9bea6c91cdb4e6dd5ef538086845f23f88515bc2cb681..fbae9e21dcf2d4b80fd06642ea13abff1563d17c204caaf95bd731d2fc195f40 100644
--- a/gost3410/ukm.go
+++ b/gost3410/ukm.go
@@ -19,6 +19,7 @@ import (
 	"math/big"
 )
 
+// Unmarshal little-endian UKM value.
 func NewUKM(raw []byte) *big.Int {
 	t := make([]byte, len(raw))
 	for i := 0; i < len(t); i++ {
diff --git a/gost34112012256/hash.go b/gost34112012256/hash.go
index dd28ddadb50c9e7cc8a7c869cd6a9e125e225d347bab643320014d31559cc6bb..23bd53e584bf6e9a8baa80ba1d26d8b40d7a221fd7b99d006babbec36ea04864 100644
--- a/gost34112012256/hash.go
+++ b/gost34112012256/hash.go
@@ -14,7 +14,7 @@ // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 // GOST R 34.11-2012 256-bit hash function.
-// RFC 6986.
+// RFC 6986. Big-endian hash output.
 package gost34112012256
 
 import (
diff --git a/gost34112012512/hash.go b/gost34112012512/hash.go
index ae58db8ddb1c4649644620af1c3347ddb72a7a988c69d602709053c93e50453e..50ab15d36cf17be31cfe8095e7f277cfa7a9ba45aae07c2c833f903bd923aedf 100644
--- a/gost34112012512/hash.go
+++ b/gost34112012512/hash.go
@@ -14,7 +14,7 @@ // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 // GOST R 34.11-2012 512-bit hash function.
-// RFC 6986.
+// RFC 6986. Big-endian hash output.
 package gost34112012512
 
 import (