diff --git a/cmd/web.go b/cmd/web.go
index 74da86d40..0b8c9b11b 100644
--- a/cmd/web.go
+++ b/cmd/web.go
@@ -43,7 +43,7 @@ func newMartini() *martini.ClassicMartini {
 	m := martini.New()
 	m.Use(middleware.Logger())
 	m.Use(martini.Recovery())
-	m.Use(martini.Static("public", martini.StaticOptions{SkipLogging: !base.RouterLog}))
+	m.Use(martini.Static("public", martini.StaticOptions{SkipLogging: !base.DisableRouterLog}))
 	m.MapTo(r, (*martini.Routes)(nil))
 	m.Action(r.Handle)
 	return &martini.ClassicMartini{m, r}
diff --git a/conf/app.ini b/conf/app.ini
index 77b808611..4f76db4de 100644
--- a/conf/app.ini
+++ b/conf/app.ini
@@ -20,7 +20,7 @@ HTTP_ADDR =
 HTTP_PORT = 3000
 ; Disable CDN even in "prod" mode
 OFFLINE_MODE = false
-ROUTER_LOG = true
+DISABLE_ROUTER_LOG = false
 ; Generate steps:
 ; $ cd path/to/gogs/custom/https
 ; $ go run $GOROOT/src/pkg/crypto/tls/generate_cert.go -ca=true -duration=8760h0m0s -host=myhost.example.com
diff --git a/models/action.go b/models/action.go
index 231a7a548..ef9e260a0 100644
--- a/models/action.go
+++ b/models/action.go
@@ -30,14 +30,15 @@ const (
 	OP_PULL_REQUEST
 	OP_TRANSFER_REPO
 	OP_PUSH_TAG
+	OP_COMMENT_ISSUE
 )
 
 // Action represents user operation type and other information to repository.,
 // it implemented interface base.Actioner so that can be used in template render.
 type Action struct {
 	Id           int64
-	UserId       int64  // Receiver user id.
-	OpType       int    // Operations: CREATE DELETE STAR ...
+	UserId       int64 // Receiver user id.
+	OpType       int
 	ActUserId    int64  // Action user id.
 	ActUserName  string // Action user name.
 	ActEmail     string
diff --git a/models/oauth2.go b/models/oauth2.go
index 97ba519c5..61044d688 100644
--- a/models/oauth2.go
+++ b/models/oauth2.go
@@ -80,3 +80,9 @@ func DeleteOauth2ById(id int64) error {
 	_, err := orm.Delete(&Oauth2{Id: id})
 	return err
 }
+
+// CleanUnbindOauth deletes all unbind OAuthes.
+func CleanUnbindOauth() error {
+	_, err := orm.Delete(&Oauth2{Uid: -1})
+	return err
+}
diff --git a/modules/base/conf.go b/modules/base/conf.go
index 73552732b..cbd6532ba 100644
--- a/modules/base/conf.go
+++ b/modules/base/conf.go
@@ -45,16 +45,16 @@ type Oauther struct {
 }
 
 var (
-	AppVer      string
-	AppName     string
-	AppLogo     string
-	AppUrl      string
-	OfflineMode bool
-	RouterLog   bool
-	ProdMode    bool
-	Domain      string
-	SecretKey   string
-	RunUser     string
+	AppVer           string
+	AppName          string
+	AppLogo          string
+	AppUrl           string
+	OfflineMode      bool
+	DisableRouterLog bool
+	ProdMode         bool
+	Domain           string
+	SecretKey        string
+	RunUser          string
 
 	RepoRootPath string
 	ScriptType   string
@@ -330,7 +330,7 @@ func NewConfigContext() {
 	AppUrl = Cfg.MustValue("server", "ROOT_URL")
 	Domain = Cfg.MustValue("server", "DOMAIN")
 	OfflineMode = Cfg.MustBool("server", "OFFLINE_MODE", false)
-	RouterLog = Cfg.MustBool("server", "ROUTER_LOG", true)
+	DisableRouterLog = Cfg.MustBool("server", "DISABLE_ROUTER_LOG", false)
 	SecretKey = Cfg.MustValue("security", "SECRET_KEY")
 
 	InstallLock = Cfg.MustBool("security", "INSTALL_LOCK", false)
diff --git a/modules/base/template.go b/modules/base/template.go
index a69a54618..135be107f 100644
--- a/modules/base/template.go
+++ b/modules/base/template.go
@@ -117,6 +117,8 @@ func ActionIcon(opType int) string {
 		return "exclamation-circle"
 	case 8: // Transfer repository.
 		return "share"
+	case 10: // Comment issue.
+		return "comment"
 	default:
 		return "invalid type"
 	}
@@ -130,6 +132,8 @@ const (
 <div><img src="%s?s=16" alt="user-avatar"/> %s</div>`
 	TPL_TRANSFER_REPO = `<a href="/user/%s">%s</a> transfered repository <code>%s</code> to <a href="/%s">%s</a>`
 	TPL_PUSH_TAG      = `<a href="/user/%s">%s</a> pushed tag <a href="/%s/src/%s" rel="nofollow">%s</a> at <a href="/%s">%s</a>`
+	TPL_COMMENT_ISSUE = `<a href="/user/%s">%s</a> commented on issue <a href="/%s/issues/%s">%s#%s</a>
+<div><img src="%s?s=16" alt="user-avatar"/> %s</div>`
 )
 
 type PushCommit struct {
@@ -179,6 +183,10 @@ func ActionDesc(act Actioner) string {
 		return fmt.Sprintf(TPL_TRANSFER_REPO, actUserName, actUserName, repoLink, newRepoLink, newRepoLink)
 	case 9: // Push tag.
 		return fmt.Sprintf(TPL_PUSH_TAG, actUserName, actUserName, repoLink, branch, branch, repoLink, repoLink)
+	case 10: // Comment issue.
+		infos := strings.SplitN(content, "|", 2)
+		return fmt.Sprintf(TPL_COMMENT_ISSUE, actUserName, actUserName, repoLink, infos[0], repoLink, infos[0],
+			AvatarLink(email), infos[1])
 	default:
 		return "invalid type"
 	}
diff --git a/modules/hooks/hooks.go b/modules/hooks/hooks.go
index 2b53dbfbb..a3a59454e 100644
--- a/modules/hooks/hooks.go
+++ b/modules/hooks/hooks.go
@@ -77,7 +77,7 @@ func handleQueue() {
 				log.Error("hooks.handleQueue: Fail to deliver hook: %v", err)
 				continue
 			}
-			log.Info("Hook delivered")
+			log.Info("Hook delivered: %s", string(data))
 		}
 	}
 }
diff --git a/modules/middleware/logger.go b/modules/middleware/logger.go
index d815b90c2..1ee030a08 100644
--- a/modules/middleware/logger.go
+++ b/modules/middleware/logger.go
@@ -24,7 +24,7 @@ func init() {
 
 func Logger() martini.Handler {
 	return func(res http.ResponseWriter, req *http.Request, ctx martini.Context, log *log.Logger) {
-		if !base.RouterLog {
+		if base.DisableRouterLog {
 			return
 		}
 
diff --git a/routers/admin/admin.go b/routers/admin/admin.go
index 96721bfde..910027881 100644
--- a/routers/admin/admin.go
+++ b/routers/admin/admin.go
@@ -98,9 +98,36 @@ func updateSystemStatus() {
 	sysStatus.NumGC = m.NumGC
 }
 
+// Operation types.
+const (
+	OT_CLEAN_OAUTH = iota + 1
+)
+
 func Dashboard(ctx *middleware.Context) {
 	ctx.Data["Title"] = "Admin Dashboard"
 	ctx.Data["PageIsDashboard"] = true
+
+	// Run operation.
+	op, _ := base.StrTo(ctx.Query("op")).Int()
+	if op > 0 {
+		var err error
+		var success string
+
+		switch op {
+		case OT_CLEAN_OAUTH:
+			success = "All unbind OAuthes have been deleted."
+			err = models.CleanUnbindOauth()
+		}
+
+		if err != nil {
+			ctx.Flash.Error(err.Error())
+		} else {
+			ctx.Flash.Success(success)
+		}
+		ctx.Redirect("/admin")
+		return
+	}
+
 	ctx.Data["Stats"] = models.GetStatistic()
 	updateSystemStatus()
 	ctx.Data["SysStatus"] = sysStatus
@@ -153,7 +180,7 @@ func Config(ctx *middleware.Context) {
 	ctx.Data["AppUrl"] = base.AppUrl
 	ctx.Data["Domain"] = base.Domain
 	ctx.Data["OfflineMode"] = base.OfflineMode
-	ctx.Data["RouterLog"] = base.RouterLog
+	ctx.Data["DisableRouterLog"] = base.DisableRouterLog
 	ctx.Data["RunUser"] = base.RunUser
 	ctx.Data["RunMode"] = strings.Title(martini.Env)
 	ctx.Data["RepoRootPath"] = base.RepoRootPath
diff --git a/routers/repo/issue.go b/routers/repo/issue.go
index 4e2076620..2bd2f33a1 100644
--- a/routers/repo/issue.go
+++ b/routers/repo/issue.go
@@ -295,5 +295,39 @@ func Comment(ctx *middleware.Context, params martini.Params) {
 		}
 	}
 
+	// Notify watchers.
+	if err = models.NotifyWatchers(&models.Action{ActUserId: ctx.User.Id, ActUserName: ctx.User.Name, ActEmail: ctx.User.Email,
+		OpType: models.OP_COMMENT_ISSUE, Content: fmt.Sprintf("%d|%s", issue.Index, strings.Split(content, "\n")[0]),
+		RepoId: ctx.Repo.Repository.Id, RepoName: ctx.Repo.Repository.Name, RefName: ""}); err != nil {
+		ctx.Handle(500, "issue.CreateIssue(NotifyWatchers)", err)
+		return
+	}
+
+	// Mail watchers and mentions.
+	if base.Service.NotifyMail {
+		issue.Content = content
+		tos, err := mailer.SendIssueNotifyMail(ctx.User, ctx.Repo.Owner, ctx.Repo.Repository, issue)
+		if err != nil {
+			ctx.Handle(500, "issue.Comment(SendIssueNotifyMail)", err)
+			return
+		}
+
+		tos = append(tos, ctx.User.LowerName)
+		ms := base.MentionPattern.FindAllString(issue.Content, -1)
+		newTos := make([]string, 0, len(ms))
+		for _, m := range ms {
+			if com.IsSliceContainsStr(tos, m[1:]) {
+				continue
+			}
+
+			newTos = append(newTos, m[1:])
+		}
+		if err = mailer.SendIssueMentionMail(ctx.Render, ctx.User, ctx.Repo.Owner,
+			ctx.Repo.Repository, issue, models.GetUserEmailsByNames(newTos)); err != nil {
+			ctx.Handle(500, "issue.Comment(SendIssueMentionMail)", err)
+			return
+		}
+	}
+
 	ctx.Redirect(fmt.Sprintf("%s/issues/%d", ctx.Repo.RepoLink, index))
 }
diff --git a/templates/admin/config.tmpl b/templates/admin/config.tmpl
index 8ba6b60cd..96565bac8 100644
--- a/templates/admin/config.tmpl
+++ b/templates/admin/config.tmpl
@@ -20,8 +20,8 @@
                     <dd>{{.Domain}}</dd>
                     <dt>Offline Mode</dt>
                     <dd><i class="fa fa{{if .OfflineMode}}-check{{end}}-square-o"></i></dd>
-                    <dt>Router Log</dt>
-                    <dd><i class="fa fa{{if .RouterLog}}-check{{end}}-square-o"></i></dd>
+                    <dt>Disable Router Log</dt>
+                    <dd><i class="fa fa{{if .DisableRouterLog}}-check{{end}}-square-o"></i></dd>
                     <hr/>
                     <dt>Run User</dt>
                     <dd>{{.RunUser}}</dd>
diff --git a/templates/admin/dashboard.tmpl b/templates/admin/dashboard.tmpl
index 76539842d..e8dca09e5 100644
--- a/templates/admin/dashboard.tmpl
+++ b/templates/admin/dashboard.tmpl
@@ -3,6 +3,7 @@
 <div id="body" class="container" data-page="admin">
     {{template "admin/nav" .}}
     <div id="admin-container" class="col-md-10">
+        {{template "base/alert" .}}
         <div class="panel panel-default">
             <div class="panel-heading">
                 Statistic
@@ -13,6 +14,29 @@
             </div>
         </div>
 
+        <div class="panel panel-default">
+            <div class="panel-heading">
+                Operations
+            </div>
+
+            <div class="panel-body">
+                <table class="table">
+                    <thead>
+                        <tr>
+                            <th>Name</th>
+                            <th>Op.</th>
+                        </tr>
+                    </thead>
+                    <tbody>
+                        <tr>
+                            <td>Clean unbind OAuthes</td>
+                            <td><i class="fa fa-caret-square-o-right"></i> <a href="/admin?op=1">Run</a></td>
+                        </tr>
+                    </tbody>
+                </table>
+            </div>
+        </div>
+
         <div class="panel panel-default">
             <div class="panel-heading">
                 System Monitor Status