diff --git a/repo.go b/repo.go
index e22b3558..0c1ab7d1 100644
--- a/repo.go
+++ b/repo.go
@@ -696,7 +696,7 @@ func (r *Repo) AddTargets(paths []string, custom json.RawMessage) error {
 	return r.AddTargetsWithExpires(paths, custom, data.DefaultExpires("targets"))
 }
 
-func (r *Repo) AddDigestTargets(digest string, digestAlg string, length int64, custom json.RawMessage, path string) error {
+func (r *Repo) AddTargetsWithDigest(digest string, digestAlg string, length int64, custom json.RawMessage, path string) error {
 	expires := data.DefaultExpires("targets")
 
 	// TODO: support delegated targets
@@ -711,6 +711,8 @@ func (r *Repo) AddDigestTargets(digest string, digestAlg string, length int64, c
 		return err
 	}
 
+	// If custom is provided, set custom, otherwise maintain existing custom
+	// metadata
 	if len(custom) > 0 {
 		meta.Custom = &custom
 	} else if t, ok := t.Targets[path]; ok {
diff --git a/repo_test.go b/repo_test.go
index 287acae0..f8d804f8 100644
--- a/repo_test.go
+++ b/repo_test.go
@@ -1761,7 +1761,7 @@ func (rs *RepoSuite) TestSignDigest(c *C) {
 	hash := "bc11b176a293bb341a0f2d0d226f52e7fcebd186a7c4dfca5fc64f305f06b94c"
 	size := int64(42)
 
-	c.Assert(r.AddDigestTargets(hash, "sha256", size, nil, digest), IsNil)
+	c.Assert(r.AddTargetsWithDigest(hash, "sha256", size, nil, digest), IsNil)
 	c.Assert(r.Snapshot(), IsNil)
 	c.Assert(r.Timestamp(), IsNil)
 	c.Assert(r.Commit(), IsNil)