--- Revision 326235626361
+++ Revision 376530323866
@@ -1,4 +1,3 @@
-
 view = libcouchbase_view_new(ddoc_name, view_name, options = NULL)
 view->ddoc_name
 view->view_name
@@ -15,6 +14,10 @@
 callbacks->prev_page_key_callback
 callbacks->head_callback
 callbacks->row_callback
+
+# could you give some usecase  for `next_key_callback()`?
+# it should be called once the execution flow meets the 
+# document (and passes its key to callback)? am I right?
 
 next_key_callback(view, next_key)
 prev_key_callback(view, prev_key)