diff --git a/types/pluralize/index.d.ts b/types/pluralize/index.d.ts
index 0a77d87a59..7a11a23839 100644
--- a/types/pluralize/index.d.ts
+++ b/types/pluralize/index.d.ts
@@ -57,9 +57,23 @@ interface PluralizeStatic {
      * @param word
      */
     addUncountableRule(word: string|RegExp): void;
+
+    /**
+     * Test if provided word is plural.
+     *
+     * @param word
+     */
+    isPlural(word: string): boolean;
+
+    /**
+     * Test if provided word is singular.
+     *
+     * @param word
+     */
+    isSingular(word: string): boolean;
 }
 
 declare module "pluralize" {
     export = pluralize;
 }
-declare var pluralize: PluralizeStatic;
\ No newline at end of file
+declare var pluralize: PluralizeStatic;
diff --git a/types/pluralize/pluralize-tests.ts b/types/pluralize/pluralize-tests.ts
index 951fe0b91a..16c599aab8 100644
--- a/types/pluralize/pluralize-tests.ts
+++ b/types/pluralize/pluralize-tests.ts
@@ -22,4 +22,10 @@ pluralize.plural('irregular'); //=> "regular"
 
 pluralize.plural('paper'); //=> "papers"
 pluralize.addUncountableRule('paper');
-pluralize.plural('paper'); //=> "paper"
\ No newline at end of file
+pluralize.plural('paper'); //=> "paper"
+
+pluralize.isPlural('test') //=> false
+pluralize.isSingular('test') //=> true
+
+pluralize.isPlural('tests') //=> true
+pluralize.isSingular('tests') //=> false