README.md.erb in debug-1.4.0

- old
+ new

@@ -58,13 +58,19 @@
 
 There are several options for (1) and (2). Please choose your favorite way.
 
 ### Modify source code with [`binding.break`](#bindingbreak-method) (similar to `binding.pry` or `binding.irb`)
 
-If you can modify the source code, you can use the debugger by adding `require 'debug'` line at the top of your program and putting [`binding.break`](#bindingbreak-method) method (`binding.b` for short) into lines where you want to stop as breakpoints like `binding.pry` and `binding.irb`.
-After that, you run the program as usual and you will enter the debug console at breakpoints you inserted.
+If you can modify the source code, you can use the debugger by adding `require 'debug'` at the top of your program and putting [`binding.break`](#bindingbreak-method) method into lines where you want to stop as breakpoints like `binding.pry` and `binding.irb`.
 
+You can also use its 2 aliases in the same way:
+
+- `binding.b`
+- `debugger`
+
+After that, run the program as usual and you will enter the debug console at breakpoints you inserted.
+
 The following example shows the demonstration of [`binding.break`](#bindingbreak-method).
 
 ```shell
 $ cat target.rb                        # Sample program
 require 'debug'
@@ -344,11 +350,11 @@
 
 ```
 $ rdbg --open=[frontend] target.rb
 ```
 
-will open a debug port and `[frontned]` can attache to the port.
+will open a debug port and `[frontend]` can attach to the port.
 
 Also `open` command allows opening the debug port.
 
 #### VSCode integration
 
@@ -425,10 +431,12 @@
 
 Type `devtools://devtools/bundled/inspector.html?ws=127.0.0.1:43633` in the address-bar on Chrome browser, and you can continue the debugging with chrome browser.
 
 Also `open chrome` command works like `open vscode`.
 
-For more information about how to use Chrome debugging, you might want to read [here](https://developer.chrome.com/docs/devtools/)
+For more information about how to use Chrome debugging, you might want to read [here](https://developer.chrome.com/docs/devtools/).
+
+Note: If you want to maximize Chrome DevTools, click [Toggle Device Toolbar](https://developer.chrome.com/docs/devtools/device-mode/#viewport).
 
 ## Configuration
 
 You can configure the debugger's behavior with debug commands and environment variables.
 When the debug session is started, initial scripts are loaded so you can put your favorite configurations in the initial scripts.