diff --git a/doc/snow.txt b/doc/snow.txt
index aa0746b84a..3f14204cb8 100644
--- a/doc/snow.txt
+++ b/doc/snow.txt
@@ -2,6 +2,16 @@
 SNOW Video Codec Specification Draft 20070103
 =============================================
 
+Intro:
+======
+This Specification describes the snow syntax and semmantics as well as
+how to decode snow.
+The decoding process is precissely described and any compliant decoder
+MUST produce the exactly same output for a spec conformant snow stream.
+For encoding though any process which generates a stream compliant to
+the syntactical and semmantical requirements and which is decodeable by
+the process described in this spec shall be considered a conformant
+snow encoder.
 
 Definitions:
 ============