diff --git a/ChangeLog.md b/ChangeLog.md
index 78eb1fd..00c0ae3 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,15 @@
 # Revision history for config-parser
 
-## 0.1.0.0  -- YYYY-mm-dd
+## 1.0.0.0  -- 2017-12-04
+
+* Removed 'ConfigParser' constructor with janky call to 'error'. Non-unique keys
+  will now cause parsing to fail, instead.
+* Duplicate keys in config files will now cause parsing to fail.
+* 'ConfigOption' now has a 'required' field to specify that omitting a
+  particular key from a config file is an error. Omiting required keys causes
+  parsing to fail.
+* The 'boundedIntegral' parser is now correctly exported.
+
+## 0.2.0.0  -- 2017-10-31
 
 * First version. Released on an unsuspecting world.
diff --git a/README.md b/README.md
index 61732fc..adb6aab 100644
--- a/README.md
+++ b/README.md
@@ -31,19 +31,22 @@ import Text.ConfigParser
 cp :: ConfigParser (Maybe String, Maybe Integer, [Integer])
 cp = configParser (Nothing, Nothing, [])
     [ ConfigOption
-        { key    = "a_string"
-        , parser = string
-        , action = \s (_,n,ns) -> (Just s, n, ns)
+        { key      = "a_string"
+        , required = True
+        , parser   = string
+        , action   = \s (_,n,ns) -> (Just s, n, ns)
         }
     , ConfigOption
-        { key    = "a_number"
-        , parser = integer
-        , action = \n (s,_,ns) -> (s, Just n, ns)
+        { key      = "a_number"
+        , required = True
+        , parser   = integer
+        , action   = \n (s,_,ns) -> (s, Just n, ns)
         }
     , ConfigOption
-        { key    = "a_list"
-        , parser = list integer
-        , action = \ns (s,n,_) -> (s, n, ns)
+        { key      = "a_list"
+        , required = True
+        , parser   = list integer
+        , action   = \ns (s,n,_) -> (s, n, ns)
         }
     ]
 
diff --git a/config-parser.cabal b/config-parser.cabal
index 8d3cf66..d85695d 100644
--- a/config-parser.cabal
+++ b/config-parser.cabal
@@ -1,5 +1,5 @@
 name:                config-parser
-version:             0.2.0.0
+version:             1.0.0.0
 synopsis:            Parse config files using parsec and generate parse errors
                      on unhandled keys
 description:         This is yet another entry in Haskell's enourmous collection