diff --git a/devtools/hackdoc/source/source_local.go b/devtools/hackdoc/source/source_local.go
index 35ad172..feecd8b 100644
--- a/devtools/hackdoc/source/source_local.go
+++ b/devtools/hackdoc/source/source_local.go
@@ -1,6 +1,7 @@
 package source
 
 import (
+	"context"
 	"fmt"
 	"io/ioutil"
 	"os"
@@ -29,7 +30,7 @@
 	return s.root + "/" + path, nil
 }
 
-func (s *LocalSource) IsFile(path string) (bool, error) {
+func (s *LocalSource) IsFile(ctx context.Context, path string) (bool, error) {
 	path, err := s.resolve(path)
 	if err != nil {
 		return false, err
@@ -44,7 +45,7 @@
 	return !stat.IsDir(), nil
 }
 
-func (s *LocalSource) ReadFile(path string) ([]byte, error) {
+func (s *LocalSource) ReadFile(ctx context.Context, path string) ([]byte, error) {
 	path, err := s.resolve(path)
 	if err != nil {
 		return nil, err
@@ -53,7 +54,7 @@
 	return ioutil.ReadFile(path)
 }
 
-func (s *LocalSource) IsDirectory(path string) (bool, error) {
+func (s *LocalSource) IsDirectory(ctx context.Context, path string) (bool, error) {
 	path, err := s.resolve(path)
 	if err != nil {
 		return false, err
@@ -68,11 +69,9 @@
 	return stat.IsDir(), nil
 }
 
-func (s *LocalSource) CacheSet(dependencies []string, key string, value interface{}) {
-	// Swallow writes. The local filesystem can always change underneath us and
-	// we're not tracking anything, so we cannot ever keep caches.
-}
-
-func (s *LocalSource) CacheGet(key string) interface{} {
-	return nil
+func (s *LocalSource) WebLinks(fpath string) []WebLink {
+	gitURL := fmt.Sprintf(FlagGitwebURLPattern, "master", fpath)
+	return []WebLink{
+		WebLink{Kind: "gitweb", LinkLabel: "master", LinkURL: gitURL},
+	}
 }