diff --git a/oeis.cabal b/oeis.cabal
--- a/oeis.cabal
+++ b/oeis.cabal
@@ -1,5 +1,5 @@
 name:         oeis
-version:      0.3.0
+version:      0.3.1
 stability:    experimental
 category:     Math
 synopsis:     Interface to the Online Encyclopedia of Integer Sequences
diff --git a/src/Math/OEIS.hs b/src/Math/OEIS.hs
--- a/src/Math/OEIS.hs
+++ b/src/Math/OEIS.hs
@@ -22,7 +22,7 @@
 
 import Control.Arrow (second, (***))
 import Data.Char (isDigit, isSpace, toUpper, toLower)
-import Data.List (intersperse, isPrefixOf, tails, foldl')
+import Data.List (intercalate, isPrefixOf, tails, foldl')
 import Data.Maybe (listToMaybe, fromMaybe)
 import Network.HTTP -- (simpleHTTP, rspBody, rspCode, rqBody, rqHeaders, rqMethod, rqURI, Request(..), GET)
 import Network.URI (escapeURIString, isAllowedInURI, parseURI, URI)
@@ -159,7 +159,7 @@
 idSearchURI n = baseSearchURI ++ "id:" ++ n
 
 seqSearchURI :: SequenceData -> String
-seqSearchURI xs = baseSearchURI ++ (concat . intersperse "," . map show $ xs)
+seqSearchURI xs = baseSearchURI ++ intercalate "," (map show xs)
 
 data LookupError = LookupError deriving Show
 
@@ -196,7 +196,7 @@
 
 -- | OEIS keywords. For more information on the meaning of each keyword, see
 -- <http://oeis.org/eishelp2.html#RK>.
-data Keyword = Base | Bref | Cofr | Cons | Core | Dead | Dumb | Dupe |
+data Keyword = Base | Bref | Changed | Cofr | Cons | Core | Dead | Dumb | Dupe |
                Easy | Eigen | Fini | Frac | Full | Hard | More | Mult |
                New | Nice | Nonn | Obsc | Sign | Tabf | Tabl | Uned |
                Unkn | Walk | Word