diff --git a/config/notifiers.go b/config/notifiers.go
index 583827e6..3dc42948 100644
--- a/config/notifiers.go
+++ b/config/notifiers.go
@@ -305,6 +305,8 @@ type SlackConfig struct {
 	Fallback    string         `yaml:"fallback,omitempty" json:"fallback,omitempty"`
 	IconEmoji   string         `yaml:"icon_emoji,omitempty" json:"icon_emoji,omitempty"`
 	IconURL     string         `yaml:"icon_url,omitempty" json:"icon_url,omitempty"`
+	ImageURL    string         `yaml:"image_url,omitempty" json:"image_url,omitempty"`
+	ThumbURL    string         `yaml:"thumb_url,omitempty" json:"thumb_url,omitempty"`
 	LinkNames   bool           `yaml:"link_names,omitempty" json:"link_names,omitempty"`
 	Actions     []*SlackAction `yaml:"actions,omitempty" json:"actions,omitempty"`
 }
diff --git a/notify/impl.go b/notify/impl.go
index f7138369..f1d02f77 100644
--- a/notify/impl.go
+++ b/notify/impl.go
@@ -667,6 +667,8 @@ type slackAttachment struct {
 	Fallback  string               `json:"fallback"`
 	Fields    []config.SlackField  `json:"fields,omitempty"`
 	Actions   []config.SlackAction `json:"actions,omitempty"`
+	ImageURL  string               `json:"image_url,omitempty"`
+	ThumbURL  string               `json:"thumb_url,omitempty"`
 	Footer    string               `json:"footer"`
 
 	Color    string   `json:"color,omitempty"`
@@ -687,6 +689,8 @@ func (n *Slack) Notify(ctx context.Context, as ...*types.Alert) (bool, error) {
 		Pretext:   tmplText(n.conf.Pretext),
 		Text:      tmplText(n.conf.Text),
 		Fallback:  tmplText(n.conf.Fallback),
+		ImageURL:  tmplText(n.conf.ImageURL),
+		ThumbURL:  tmplText(n.conf.ThumbURL),
 		Footer:    tmplText(n.conf.Footer),
 		Color:     tmplText(n.conf.Color),
 		MrkdwnIn:  []string{"fallback", "pretext", "text"},