diff --git a/HanziPinyin/PinyinFormatter.swift b/HanziPinyin/PinyinFormatter.swift
index 36d6cde..9aba5d6 100644
--- a/HanziPinyin/PinyinFormatter.swift
+++ b/HanziPinyin/PinyinFormatter.swift
@@ -29,9 +29,9 @@ internal struct PinyinFormatter {
         }
 
         switch format.caseType {
-        case .lowercase:
+        case .lowercased:
             formattedPinyin = formattedPinyin.lowercased()
-        case .uppercase:
+        case .uppercased:
             formattedPinyin = formattedPinyin.uppercased()
         case .capitalized:
             formattedPinyin = formattedPinyin.capitalized
diff --git a/HanziPinyin/PinyinOutputFormat.swift b/HanziPinyin/PinyinOutputFormat.swift
index 61b827b..b1d9041 100644
--- a/HanziPinyin/PinyinOutputFormat.swift
+++ b/HanziPinyin/PinyinOutputFormat.swift
@@ -20,8 +20,8 @@ public enum PinyinVCharType {
 }
 
 public enum PinyinCaseType {
-    case lowercase
-    case uppercase
+    case lowercased
+    case uppercased
     case capitalized
 }
 
@@ -31,7 +31,7 @@ public struct PinyinOutputFormat {
     public var caseType: PinyinCaseType
 
     public static var `default`: PinyinOutputFormat {
-        return PinyinOutputFormat(toneType: .none, vCharType: .vCharacter, caseType: .lowercase)
+        return PinyinOutputFormat(toneType: .none, vCharType: .vCharacter, caseType: .lowercased)
     }
 
     public init(toneType: PinyinToneType, vCharType: PinyinVCharType, caseType: PinyinCaseType) {
diff --git a/README.md b/README.md
index 551348e..f1aa79f 100644
--- a/README.md
+++ b/README.md
@@ -15,8 +15,8 @@ github "teambition/HanziPinyin"
 ```swift
 // PinyinToneType: none, toneNumber
 // PinyinVCharType: vCharacter, uUnicode, uAndColon
-// PinyinCaseType: lowercase, uppercase
-let outputFormat = PinyinOutputFormat(toneType: .none, vCharType: .vCharacter, caseType: .lowercase)
+// PinyinCaseType: lowercased, uppercased, capitalized
+let outputFormat = PinyinOutputFormat(toneType: .none, vCharType: .vCharacter, caseType: .lowercased)
 ```
 ####  Convert to Pinyin synchronously
 ```swift