diff --git a/.credo.exs b/.credo.exs
new file mode 100644
index 0000000..0875a8c
--- /dev/null
+++ b/.credo.exs
@@ -0,0 +1,68 @@
+%{
+	configs: [%{
+		name: "default",
+		files: %{
+			included: ["lib/", "test/"],
+			excluded: [~r"/_build/", ~r"/deps/"]
+		},
+		checks: [
+			{Credo.Check.Consistency.ExceptionNames},
+			{Credo.Check.Consistency.LineEndings},
+			{Credo.Check.Consistency.ParameterPatternMatching},
+			{Credo.Check.Consistency.SpaceAroundOperators},
+			{Credo.Check.Consistency.SpaceInParentheses},
+			{Credo.Check.Consistency.TabsOrSpaces},
+			
+			{Credo.Check.Design.AliasUsage, priority: :low},
+			{Credo.Check.Design.DuplicatedCode, excluded_macros: []},
+			{Credo.Check.Design.TagTODO, exit_status: 2},
+			{Credo.Check.Design.TagFIXME},
+
+			{Credo.Check.Readability.FunctionNames},
+			{Credo.Check.Readability.LargeNumbers},
+			{Credo.Check.Readability.MaxLineLength, priority: :low, max_length: 80},
+			{Credo.Check.Readability.ModuleAttributeNames},
+			{Credo.Check.Readability.ModuleDoc},
+			{Credo.Check.Readability.ModuleNames},
+			{Credo.Check.Readability.ParenthesesOnZeroArityDefs},
+			{Credo.Check.Readability.ParenthesesInCondition},
+			{Credo.Check.Readability.PredicateFunctionNames},
+			{Credo.Check.Readability.PreferImplicitTry},
+			{Credo.Check.Readability.RedundantBlankLines},
+			{Credo.Check.Readability.StringSigils},
+			{Credo.Check.Readability.TrailingBlankLine},
+			{Credo.Check.Readability.TrailingWhiteSpace},
+			{Credo.Check.Readability.VariableNames},
+			{Credo.Check.Readability.Semicolons},
+			{Credo.Check.Readability.SpaceAfterCommas},
+
+			{Credo.Check.Refactor.DoubleBooleanNegation},
+			{Credo.Check.Refactor.CondStatements},
+			{Credo.Check.Refactor.CyclomaticComplexity},
+			{Credo.Check.Refactor.FunctionArity, [ignore_defp: true]},
+			{Credo.Check.Refactor.LongQuoteBlocks},
+			{Credo.Check.Refactor.MatchInCondition},
+			{Credo.Check.Refactor.NegatedConditionsInUnless},
+			{Credo.Check.Refactor.NegatedConditionsWithElse},
+			{Credo.Check.Refactor.Nesting},
+			{Credo.Check.Refactor.PipeChainStart},
+			{Credo.Check.Refactor.UnlessWithElse},
+
+			{Credo.Check.Warning.BoolOperationOnSameValues},
+			{Credo.Check.Warning.IExPry},
+			{Credo.Check.Warning.IoInspect},
+			{Credo.Check.Warning.LazyLogging},
+			{Credo.Check.Warning.OperationOnSameValues},
+			{Credo.Check.Warning.OperationWithConstantResult},
+			{Credo.Check.Warning.UnusedEnumOperation},
+			{Credo.Check.Warning.UnusedFileOperation},
+			{Credo.Check.Warning.UnusedKeywordOperation},
+			{Credo.Check.Warning.UnusedListOperation},
+			{Credo.Check.Warning.UnusedPathOperation},
+			{Credo.Check.Warning.UnusedRegexOperation},
+			{Credo.Check.Warning.UnusedStringOperation},
+			{Credo.Check.Warning.UnusedTupleOperation},
+			{Credo.Check.Warning.RaiseInsideRescue},
+		]
+	}]
+}
diff --git a/test/glicko_test.exs b/test/glicko_test.exs
index 76cd6db..dc04122 100644
--- a/test/glicko_test.exs
+++ b/test/glicko_test.exs
@@ -8,7 +8,7 @@ defmodule GlickoTest do
 
 	doctest Glicko
 
-	@player Player.new_v1([rating: 1500, rating_deviation: 200]) |> Player.to_v2
+	@player [rating: 1500, rating_deviation: 200] |> Player.new_v1 |> Player.to_v2
 
 	@results [
 		Result.new(Player.new_v1([rating: 1400, rating_deviation: 30]), :win),