diff --git a/README.md b/README.md
index afdbcdb..6b9032b 100644
--- a/README.md
+++ b/README.md
@@ -163,7 +163,7 @@ API
   Tests if this Long's value is odd.
 
 * Long#**isPositive**(): `boolean`<br />
-  Tests if this Long's value is positive.
+  Tests if this Long's value is positive or zero.
 
 * Long#**isZero**/**eqz**(): `boolean`<br />
   Tests if this Long's value equals zero.
diff --git a/index.d.ts b/index.d.ts
index a94bb28..1f1fd03 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -210,7 +210,7 @@ declare class Long {
   isOdd(): boolean;
 
   /**
-   * Tests if this Long's value is positive.
+   * Tests if this Long's value is positive or zero.
    */
   isPositive(): boolean;
 
diff --git a/index.js b/index.js
index c3b437e..2fd859b 100644
--- a/index.js
+++ b/index.js
@@ -599,7 +599,7 @@ LongPrototype.isNegative = function isNegative() {
 };
 
 /**
- * Tests if this Long's value is positive.
+ * Tests if this Long's value is positive or zero.
  * @this {!Long}
  * @returns {boolean}
  */