diff --git a/conf/sources.txt b/conf/sources.txt
new file mode 100644
index 000000000..e69de29bb
diff --git a/doc/bitbucket.go b/doc/bitbucket.go
new file mode 100644
index 000000000..b91fc718f
--- /dev/null
+++ b/doc/bitbucket.go
@@ -0,0 +1,114 @@
+// Copyright 2011 Gary Burd
+// Copyright 2013 Unknown
+//
+// Licensed under the Apache License, Version 2.0 (the "License"): you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations
+// under the License.
+
+package doc
+
+import (
+	"net/http"
+	"path"
+	"regexp"
+
+	"github.com/Unknwon/gowalker/utils"
+)
+
+var (
+	bitbucketPattern = regexp.MustCompile(`^bitbucket\.org/(?P<owner>[a-z0-9A-Z_.\-]+)/(?P<repo>[a-z0-9A-Z_.\-]+)(?P<dir>/[a-z0-9A-Z_.\-/]*)?$`)
+	bitbucketEtagRe  = regexp.MustCompile(`^(hg|git)-`)
+)
+
+func getBitbucketDoc(client *http.Client, match map[string]string, savedEtag string) (*Package, error) {
+
+	if m := bitbucketEtagRe.FindStringSubmatch(savedEtag); m != nil {
+		match["vcs"] = m[1]
+	} else {
+		var repo struct {
+			Scm string
+		}
+		if err := httpGetJSON(client, expand("https://api.bitbucket.org/1.0/repositories/{owner}/{repo}", match), &repo); err != nil {
+			return nil, err
+		}
+		match["vcs"] = repo.Scm
+	}
+
+	tags := make(map[string]string)
+	for _, nodeType := range []string{"branches", "tags"} {
+		var nodes map[string]struct {
+			Node string
+		}
+		if err := httpGetJSON(client, expand("https://api.bitbucket.org/1.0/repositories/{owner}/{repo}/{0}", match, nodeType), &nodes); err != nil {
+			return nil, err
+		}
+		for t, n := range nodes {
+			tags[t] = n.Node
+		}
+	}
+
+	var err error
+	match["tag"], match["commit"], err = bestTag(tags, defaultTags[match["vcs"]])
+	if err != nil {
+		return nil, err
+	}
+
+	// Check revision tag.
+	etag := expand("{vcs}-{commit}", match)
+	if etag == savedEtag {
+		return nil, errNotModified
+	}
+
+	var node struct {
+		Files []struct {
+			Path string
+		}
+		Directories []string
+	}
+
+	if err := httpGetJSON(client, expand("https://api.bitbucket.org/1.0/repositories/{owner}/{repo}/src/{tag}{dir}/", match), &node); err != nil {
+		return nil, err
+	}
+
+	// Get source file data.
+	files := make([]*source, 0, 5)
+	for _, f := range node.Files {
+		_, name := path.Split(f.Path)
+		if utils.IsDocFile(name) {
+			files = append(files, &source{
+				name:      name,
+				browseURL: expand("https://bitbucket.org/{owner}/{repo}/src/{tag}/{0}", match, f.Path),
+				rawURL:    expand("https://api.bitbucket.org/1.0/repositories/{owner}/{repo}/raw/{tag}/{0}", match, f.Path),
+			})
+		}
+	}
+
+	if len(files) == 0 && len(node.Directories) == 0 {
+		return nil, NotFoundError{"Directory tree does not contain Go files and subdirs."}
+	}
+
+	// Fetch file from VCS.
+	if err := fetchFiles(client, files, nil); err != nil {
+		return nil, err
+	}
+
+	// Start generating data.
+	w := &walker{
+		lineFmt: "#cl-%d",
+		pdoc: &Package{
+			ImportPath:  match["importPath"],
+			ProjectName: match["repo"],
+			Etag:        etag,
+			Dirs:        node.Directories,
+		},
+	}
+	return w.build(files)
+}
diff --git a/i18n/en-US/usage_install.txt b/i18n/en-US/usage_install.txt
index c11c54e11..808836243 100644
--- a/i18n/en-US/usage_install.txt
+++ b/i18n/en-US/usage_install.txt
@@ -15,6 +15,8 @@ The install flags are:
 		force to update pakcages.
 	-e
 		download dependencies for examples.
+	-s
+		download from sources.
 
 The list flags accept a space-separated list of strings. To embed spaces
 in an element in the list, surround it with either single or double quotes.
diff --git a/install.go b/install.go
index a547f6b74..fe15078c7 100644
--- a/install.go
+++ b/install.go
@@ -32,6 +32,7 @@ func init() {
 		"-d": false,
 		"-u": false, // Flag for 'go get'.
 		"-e": false,
+		"-s": false,
 	}
 }
 
@@ -45,6 +46,10 @@ func printPrompt(flag string) {
 		fmt.Printf("You enabled download without installing.\n")
 	case "-e":
 		fmt.Printf("You enabled download dependencies in example.\n")
+	case "-e":
+		fmt.Printf("You enabled download dependencies in example.\n")
+	case "-s":
+		fmt.Printf("You enabled download from sources.\n")
 	}
 }