diff --git a/knotserver/git/diff.go b/knotserver/git/diff.go
index cc065b1c..81b6c736 100644
--- a/knotserver/git/diff.go
+++ b/knotserver/git/diff.go
@@ -79,6 +79,9 @@ func (g *GitRepo) Diff() (*types.NiceDiff, error) {
 
 	nd.Stat.FilesChanged = len(diffs)
 	nd.Commit.This = c.Hash.String()
+	nd.Commit.PGPSignature = c.PGPSignature
+	nd.Commit.Committer = c.Committer
+	nd.Commit.Tree = c.TreeHash.String()
 
 	if parent.Hash.IsZero() {
 		nd.Commit.Parent = ""
@@ -88,6 +91,10 @@ func (g *GitRepo) Diff() (*types.NiceDiff, error) {
 	nd.Commit.Author = c.Author
 	nd.Commit.Message = c.Message
 
+	if v, ok := c.ExtraHeaders["change-id"]; ok {
+		nd.Commit.ChangedId = string(v)
+	}
+
 	return &nd, nil
 }
 
diff --git a/types/diff.go b/types/diff.go
index a9a809b4..5978dc6d 100644
--- a/types/diff.go
+++ b/types/diff.go
@@ -40,10 +40,14 @@ func (d *Diff) Stats() DiffStat {
 // A nicer git diff representation.
 type NiceDiff struct {
 	Commit struct {
-		Message string           `json:"message"`
-		Author  object.Signature `json:"author"`
-		This    string           `json:"this"`
-		Parent  string           `json:"parent"`
+		Message      string           `json:"message"`
+		Author       object.Signature `json:"author"`
+		This         string           `json:"this"`
+		Parent       string           `json:"parent"`
+		PGPSignature string           `json:"pgp_signature"`
+		Committer    object.Signature `json:"committer"`
+		Tree         string           `json:"tree"`
+		ChangedId    string           `json:"change_id"`
 	} `json:"commit"`
 	Stat struct {
 		FilesChanged int `json:"files_changed"`