diff --git a/boards/models/post/sync.py b/boards/models/post/sync.py
--- a/boards/models/post/sync.py
+++ b/boards/models/post/sync.py
@@ -31,6 +31,7 @@ TAG_TAGS = 'tags'
 TAG_TAG = 'tag'
 TAG_ATTACHMENT_REFS = 'attachment-refs'
 TAG_ATTACHMENT_REF = 'attachment-ref'
+TAG_TRIPCODE = 'tripcode'
 
 TYPE_GET = 'get'
 
@@ -106,6 +107,10 @@ class SyncManager:
                 pub_time = et.SubElement(content_tag, TAG_PUB_TIME)
                 pub_time.text = str(post.get_pub_time_str())
 
+                if post.tripcode:
+                    tripcode = et.SubElement(content_tag, TAG_TRIPCODE)
+                    tripcode.text = post.tripcode
+
                 if len(images) > 0 or len(attachments) > 0:
                     attachments_tag = et.SubElement(content_tag, TAG_ATTACHMENTS)
                     attachment_refs = et.SubElement(model, TAG_ATTACHMENT_REFS)
diff --git a/docs/dip-2.markdown b/docs/dip-2.markdown
--- a/docs/dip-2.markdown
+++ b/docs/dip-2.markdown
@@ -27,3 +27,4 @@ This field is used for the opening post 
 This field is used for non-opening post:
 
 * thread -- ID of a post model that this post is related to.
+* tripcode