Note about XDR inability to address >32-bit bytes

diff --git a/doc/pkt.texi b/doc/pkt.texi
index f7bbe564c5b9ef7702177055af7e23ae3f2e914c..33c2f2810b9bc178f669217ff4e99401e86fe2db 100644 (file)
--- a/doc/pkt.texi
+++ b/doc/pkt.texi
@@ -50,8 +50,9 @@ drive.
 
 Path has fixed size because of hiding its actual length -- it is
 valuable metadata. Payload is appended to the header -- it is not stored
-as XDR field, because most XDR libraries will store all that data in the
-memory.
+as XDR field, because XDR has no ability to pass more than 4 GiB of
+opaque data. Moreover most XDR libraries store fields in the memory in
+practice.
 
 Depending on the packet's type, payload could store: