diff --git a/digest/algorithm.go b/digest/algorithm.go
index b71314e6..e4842d9d 100644
--- a/digest/algorithm.go
+++ b/digest/algorithm.go
@@ -79,7 +79,7 @@ func (a *Algorithm) Set(value string) error {
 	return nil
 }
 
-// New returns a new digester for the specified algorithm. If the algorithm
+// Digester returns a new digester for the specified algorithm. If the algorithm
 // does not have a digester implementation, nil will be returned. This can be
 // checked by calling Available before calling New.
 func (a Algorithm) Digester() Digester {
diff --git a/digest/digest.go b/digest/digest.go
index a9ab8e51..df97fd01 100644
--- a/digest/digest.go
+++ b/digest/digest.go
@@ -61,7 +61,7 @@ var (
 	ErrDigestUnsupported = fmt.Errorf("unsupported digest algorithm")
 )
 
-// ParseDigest parses s and returns the validated digest object. An error will
+// Parse parses s and returns the validated digest object. An error will
 // be returned if the format is invalid.
 func Parse(s string) (Digest, error) {
 	d := Digest(s)
diff --git a/reference/reference_test.go b/reference/reference_test.go
index 405c47c0..be708c4d 100644
--- a/reference/reference_test.go
+++ b/reference/reference_test.go
@@ -1,6 +1,8 @@
 package reference
 
 import (
+	_ "crypto/sha256"
+	_ "crypto/sha512"
 	"encoding/json"
 	"strconv"
 	"strings"