diff --git a/design/branched-generated-encoder.md b/design/branched-generated-encoder.md
index 9360b6f..5bacc24 100644
--- a/design/branched-generated-encoder.md
+++ b/design/branched-generated-encoder.md
@@ -121,3 +121,8 @@ The functions shall take a pointer to a type that accepts any type like (~) the
 destination's base type. We should also probably just call
 `Generator.generateDecodeValue` directly on user defined types this way, keeping
 their public `Decode` methods just for convenience.
+
+The tape package shall contain a skimming function that takes a decoder and a
+tag, and recursively consumes the decoder given the context of the tag. This
+shall be utilized by the decoder functions to skip over values if their tags
+or keys do not match up with what is expected.