compression.md

@@ -111,6 +111,19 @@ can be compressed (including header) to 19 bytes:
 	61              literal = 'a'
 	62              literal = 'b'
 
+Since the header has 12 octets, the first code has to be a literal,
+and at least one length-distance pair is required to encode more
+raw data than required for the compression header and data stream,
+the minimum compressible raw data are 17 identical bytes:
+
+	01 4C 4F 42     magic
+	06              method
+	00 00 11        rawSize = 17
+	00 00 00 04     cmpSize = 4
+	80              flags   = 10______
+	__              literal = __
+	0D 01           len/off = 16/-1
+
 
 Notes
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