diff --git a/docs/samples/sync_request.xml b/docs/samples/sync_request.xml
--- a/docs/samples/sync_request.xml
+++ b/docs/samples/sync_request.xml
@@ -1,3 +1,4 @@
+<?xml version="1.1" encoding="UTF-8" ?>
 <request>
     <version>
         <protocol>1</protocol>
diff --git a/docs/samples/sync_response.xml b/docs/samples/sync_response.xml
--- a/docs/samples/sync_response.xml
+++ b/docs/samples/sync_response.xml
@@ -1,3 +1,4 @@
+<?xml version="1.1" encoding="UTF-8" ?>
 <response>
     <status>success</status>
     <posts>