diff --git a/docs/src/api/class-framelocator.md b/docs/src/api/class-framelocator.md
index 9e57a0be87..7db64f85f3 100644
--- a/docs/src/api/class-framelocator.md
+++ b/docs/src/api/class-framelocator.md
@@ -128,7 +128,7 @@ The method finds an element matching the specified selector in the FrameLocator'
 ## method: FrameLocator.nth
 - returns: <[FrameLocator]>
 
-Returns locator to the n-th matching frame.
+Returns locator to the n-th matching frame. It's zero based, `nth(0)` selects the first frame.
 
 ### param: FrameLocator.nth.index
 - `index` <[int]>
diff --git a/docs/src/api/class-locator.md b/docs/src/api/class-locator.md
index 82257fa0cc..649e7e8ada 100644
--- a/docs/src/api/class-locator.md
+++ b/docs/src/api/class-locator.md
@@ -550,7 +550,7 @@ The method finds an element matching the specified selector in the `Locator`'s s
 ## method: Locator.nth
 - returns: <[Locator]>
 
-Returns locator to the n-th matching element.
+Returns locator to the n-th matching element. It's zero based, `nth(0)` selects the first element.
 
 ### param: Locator.nth.index
 - `index` <[int]>
diff --git a/packages/playwright-core/types/types.d.ts b/packages/playwright-core/types/types.d.ts
index 9c4885abe8..28bba91bdc 100644
--- a/packages/playwright-core/types/types.d.ts
+++ b/packages/playwright-core/types/types.d.ts
@@ -9403,7 +9403,7 @@ export interface Locator {
   }): Locator;
 
   /**
-   * Returns locator to the n-th matching element.
+   * Returns locator to the n-th matching element. It's zero based, `nth(0)` selects the first element.
    * @param index
    */
   nth(index: number): Locator;
@@ -13846,7 +13846,7 @@ export interface FrameLocator {
   }): Locator;
 
   /**
-   * Returns locator to the n-th matching frame.
+   * Returns locator to the n-th matching frame. It's zero based, `nth(0)` selects the first frame.
    * @param index
    */
   nth(index: number): FrameLocator;