diff --git a/pgtype/extra-interface.txt b/pgtype/extra-interface.txt
deleted file mode 100644
index f07818bc..00000000
--- a/pgtype/extra-interface.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-Can pass function to get inet data and function to get oid/name mapping as optional interface with io.Reader or io.Writer
-
-Could be useful for arrays of types without defined Oids like hstore.