diff --git a/Types/Remote.hs b/Types/Remote.hs
index 4e24329ecb..e2a4940582 100644
--- a/Types/Remote.hs
+++ b/Types/Remote.hs
@@ -307,10 +307,12 @@ data ImportActions a = ImportActions
 	-- bearing in mind that the file on the remote may have changed
 	-- since the ContentIdentifier was generated.
 	--
+	-- When it returns nothing, the file at the ImportLocation 
+	-- not by included in the imported tree.
+	--
 	-- When the remote is thirdPartyPopulated, this should check if the
 	-- file stored on the remote is the content of an annex object,
-	-- and return its Key, or Nothing if it is not. Should not
-	-- otherwise return Nothing.
+	-- and return its Key, or Nothing if it is not.
 	--
 	-- Throws exception on failure to access the remote.
 	, importKey :: Maybe (ImportLocation -> ContentIdentifier -> ByteSize -> MeterUpdate -> a (Maybe Key))
diff --git a/doc/design/external_special_remote_protocol/export_and_import_appendix.mdwn b/doc/design/external_special_remote_protocol/export_and_import_appendix.mdwn
index 9d474dbcbf..24004402fe 100644
--- a/doc/design/external_special_remote_protocol/export_and_import_appendix.mdwn
+++ b/doc/design/external_special_remote_protocol/export_and_import_appendix.mdwn
@@ -203,6 +203,8 @@ support a request, it can reply with `UNSUPPORTED-REQUEST`.
   ContentIdentifier specified by `EXPECTED`, or otherwise fail.  
   Replies:
   * `IMPORTKEY-SUCCESS Key`
+  * `IMPORTKEY-SKIP`  
+    This causes nothing to be imported for this file.
   * `IMPORTKEY-FAILURE ErrorMsg`
 * `RETRIEVEEXPORTEXPECTED File`  
   Retrieves the content of a file from the special remote