diff --git a/odb.go b/odb.go
index d881f63..b15851f 100644
--- a/odb.go
+++ b/odb.go
@@ -54,21 +54,6 @@ func (v *Odb) AddBackend(backend *OdbBackend, priority int) (err error) {
 	return nil
 }
 
-func (v *Odb) ReadHeader(oid *Oid) (uint64, ObjectType, error) {
-	runtime.LockOSThread()
-	defer runtime.UnlockOSThread()
-	
-	var sz C.size_t
-	var cotype C.git_otype 
-
-	ret := C.git_odb_read_header(&sz, &cotype, v.ptr, oid.toC())
-	if ret < 0 {
-		return 0, C.GIT_OBJ_BAD, MakeGitError(ret)
-	}
-
-	return uint64(sz), ObjectType(cotype), nil
-}
-	
 func (v *Odb) Exists(oid *Oid) bool {
 	ret := C.git_odb_exists(v.ptr, oid.toC())
 	return ret != 0
diff --git a/odb_test.go b/odb_test.go
index dfd2ad0..0d765b9 100644
--- a/odb_test.go
+++ b/odb_test.go
@@ -6,34 +6,6 @@ import (
 	"testing"
 )
 
-func TestOdbReadHeader(t *testing.T) {
-	repo := createTestRepo(t)
-	defer cleanupTestRepo(t, repo)
-
-	_, _ = seedTestRepo(t, repo)
-	odb, err := repo.Odb()
-	if err != nil {
-		t.Fatalf("Odb: %v", err)
-	}
-	data := []byte("hello")
-	id, err := odb.Write(data, ObjectBlob)
-	if err != nil {
-		t.Fatalf("odb.Write: %v", err)
-	}
-
-	sz, typ, err := odb.ReadHeader(id)
-	if err != nil {
-		t.Fatalf("ReadHeader: %v", err)
-	}
-	
-	if sz != uint64(len(data)) {
-		t.Errorf("ReadHeader got size %d, want %d", sz, len(data))
-	}
-	if typ != ObjectBlob {
-		t.Errorf("ReadHeader got object type %s", typ)
-	}
-}
-
 func TestOdbStream(t *testing.T) {
 	repo := createTestRepo(t)
 	defer cleanupTestRepo(t, repo)
diff --git a/walk.go b/walk.go
index c314f60..60e618d 100644
--- a/walk.go
+++ b/walk.go
@@ -194,6 +194,10 @@ func (v *RevWalk) Iterate(fun RevWalkIterator) (err error) {
 	return nil
 }
 
+func (v *RevWalk) SimplifyFirstParent() {
+	C.git_revwalk_simplify_first_parent(v.ptr)
+}
+
 func (v *RevWalk) Sorting(sm SortType) {
 	C.git_revwalk_sorting(v.ptr, C.uint(sm))
 }