diff --git a/docs/api.markdown b/docs/api.markdown
--- a/docs/api.markdown
+++ b/docs/api.markdown
@@ -23,3 +23,18 @@ associated with it.
 Get all Nth thread post. N is an opening post ID for the thread.
 
 In case of incorrect request you can get http error 404.
+
+Response JSON contains:
+
+* id
+* title
+* text
+* image (if image available)
+* image_preview (if image available)
+
+In future, it will also contain:
+
+* tags list (for thread)
+* publishing time
+* bump time
+* reply IDs (if available)