Mako 3486 add asm groups to display

source/API_Reference/SMTP_API/suppressions.md

@@ -23,8 +23,30 @@ You may only specify one group per send, and you should wait one minute after cr
 }
 {% endcodeblock %}
 
+{% anchor h2 %}
+Defining ASM Groups to display on the Manage Preferences page
+{% endanchor %}
+
+To specify which groups to display on the Manage Preferences page of an email, add the group IDs to the X-SMTPAPI header of an SMTP message, or in the x-smtpapi parameter of a [mail.send API
+call]({{root_url}}/API_Reference/Web_API/mail.html).
+If the asm_groups_to_display header is omitted, your default groups will be shown on the Manage Preferences page instead.
+
+{% warning %}
+You can specify up to 25 groups to display.
+{% endwarning %}
+
+{% codeblock lang:json %}
+{
+  "asm_groups_to_display": [1, 2, 3]
+}
+{% endcodeblock %}
+
+{% anchor h2 %}
+Groups
+{% endanchor %}
+
 You can find your group IDs by looking at the Group ID column in the Advanced Suppression Manager UI, or by calling the [GET method]({{root_url}}/API_Reference/Web_API_v3/Advanced_Suppression_Manager/groups.html#-GET) of the groups resource.
 
 Related Articles:
 
-* You can create ASM groups via the [API V3 > ASM Endpoint]({{root_url}}/API_Reference/Web_API_v3/Unsubscribe_Manager/groups.html#-POST).
+* You can create ASM groups via the [API V3 > ASM Endpoint]({{root_url}}/API_Reference/Web_API_v3/Unsubscribe_Manager/groups.html#-POST).