diff --git a/string/index.d.ts b/string/index.d.ts
index 9e4a28b709..e47c0d7eca 100644
--- a/string/index.d.ts
+++ b/string/index.d.ts
@@ -71,7 +71,7 @@ interface StringJS {
 	replaceAll(ss: string, newStr: string): StringJS;
 	
 	strip(...strings: string[]): StringJS;
-	
+
 	stripLeft(...strings: string[]): StringJS;
 
 	stripRight(...strings: string[]): StringJS;
@@ -92,6 +92,8 @@ interface StringJS {
 	
 	times(n: number): StringJS;
 	
+	titleCase(): StringJS;
+	
 	toBoolean(): boolean;
 	
 	toCSV(delimiter?: string, qualifier?: string): StringJS;
diff --git a/string/string-tests.ts b/string/string-tests.ts
index 64195738c4..2eee48b3dd 100644
--- a/string/string-tests.ts
+++ b/string/string-tests.ts
@@ -209,6 +209,10 @@ console.log(S(str).template(values).s) //'Hello JP! How are you doing during the
 S(' ').times(5).s //'     '
 S('*').times(3).s //'***'
 
+S('Like ice in the sunshine').titleCase().s // 'Like Ice In The Sunshine'
+S('data_rate').titleCase().s // 'Data_Rate'
+S('background-color').titleCase().s // 'Background-Color'
+
 S('true').toBoolean() //true
 S('false').toBoolean() //false
 S('hello').toBoolean() //false