diff --git a/docs/manifest-format.txt b/docs/manifest-format.txt
index 764e41e..5378965 100644
--- a/docs/manifest-format.txt
+++ b/docs/manifest-format.txt
@@ -39,6 +39,7 @@
     <!ATTLIST default remote   IDREF #IMPLIED>
     <!ATTLIST default revision CDATA #IMPLIED>
     <!ATTLIST default sync-j   CDATA #IMPLIED>
+    <!ATTLIST default sync-c   CDATA #IMPLIED>
 
     <!ELEMENT manifest-server (EMPTY)>
     <!ATTLIST url              CDATA #REQUIRED>
@@ -49,6 +50,7 @@
     <!ATTLIST project remote   IDREF #IMPLIED>
     <!ATTLIST project revision CDATA #IMPLIED>
     <!ATTLIST project groups   CDATA #IMPLIED>
+    <!ATTLIST project sync-c   CDATA #IMPLIED>
 
     <!ELEMENT annotation (EMPTY)>
     <!ATTLIST annotation name  CDATA #REQUIRED>