diff --git a/docs/api.md b/docs/api.md
index 12b2c17f78718..26e613903e15a 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -2440,7 +2440,7 @@ After the key is pressed once, subsequent calls to [`keyboard.down`](#keyboarddo
 
 If `key` is a single character and no modifier keys besides `Shift` are being held down, a `keypress`/`input` event will also generated. The `text` option can be specified to force an input event to be generated.
 
-> **NOTE** Modifier keys DO effect `keyboard.press`. Holding down `Shift` will type the text in upper case.
+> **NOTE** Modifier keys DO affect `keyboard.press`. Holding down `Shift` will type the text in upper case.
 
 Shortcut for [`keyboard.down`](#keyboarddownkey-options) and [`keyboard.up`](#keyboardupkey).
 
@@ -2454,7 +2454,7 @@ Dispatches a `keypress` and `input` event. This does not send a `keydown` or `ke
 page.keyboard.sendCharacter('嗨');
 ```
 
-> **NOTE** Modifier keys DO NOT effect `keyboard.sendCharacter`. Holding down `Shift` will not type the text in upper case.
+> **NOTE** Modifier keys DO NOT affect `keyboard.sendCharacter`. Holding down `Shift` will not type the text in upper case.
 
 #### keyboard.type(text[, options])
 - `text` <[string]> A text to type into a focused element.
@@ -2471,7 +2471,7 @@ await page.keyboard.type('Hello'); // Types instantly
 await page.keyboard.type('World', {delay: 100}); // Types slower, like a user
 ```
 
-> **NOTE** Modifier keys DO NOT effect `keyboard.type`. Holding down `Shift` will not type the text in upper case.
+> **NOTE** Modifier keys DO NOT affect `keyboard.type`. Holding down `Shift` will not type the text in upper case.
 
 #### keyboard.up(key)
 - `key` <[string]> Name of key to release, such as `ArrowLeft`. See [USKeyboardLayout] for a list of all key names.
@@ -3534,7 +3534,7 @@ Focuses the element, and then uses [`keyboard.down`](#keyboarddownkey-options) a
 
 If `key` is a single character and no modifier keys besides `Shift` are being held down, a `keypress`/`input` event will also be generated. The `text` option can be specified to force an input event to be generated.
 
-> **NOTE** Modifier keys DO effect `elementHandle.press`. Holding down `Shift` will type the text in upper case.
+> **NOTE** Modifier keys DO affect `elementHandle.press`. Holding down `Shift` will type the text in upper case.
 
 #### elementHandle.screenshot([options])
 - `options` <[Object]> Same options as in [page.screenshot](#pagescreenshotoptions).