diff --git a/README.md b/README.md
index 5e3464c..96b1ff0 100644
--- a/README.md
+++ b/README.md
@@ -20,18 +20,20 @@ Generate a directory structure tree
 
 Options:
   -V, --version          output the version number
-  -i, --ignore <ig>      ignore specific directory name
+  -i, --ignore <ig>      ignore specific directory name, separated by comma or '|'
   -d, --depth <depth>    specify the depth of output
   -f, --only-folder      output folder only
   --icon                 output emoji icon, prefixing filename or directory
-  -o, --output <output>  export content into a file
+  -o, --output <output>  export content into a file, appending mode by default
   -h, --help             display help for command
 ```
 
 ## Examples
 
+Ignore `.git` and `node_modules` directory
+
 ```bash
-$ treei -i '.git,node_modules'
+$ treei -i '.git,node_modules' # or treei -i'git|node_modules'
 treei
 ├──.gitignore
 ├──package-lock.json
@@ -41,6 +43,8 @@ treei
 |   └──index.js
 ```
 
+Show emoji icon, prefixing filename or directory
+
 ```bash
 $ treei -i '.git,node_modules' --icon
 treei
@@ -52,6 +56,8 @@ treei
 |   └──📄index.js
 ```
 
+Export output into result.md, and append mode by default.
+
 ```bash
 $ treei -i '.git,node_modules' -o result.md
 treei
@@ -61,6 +67,4 @@ treei
 ├──README.md
 └──src
 |   └──index.js
-
-# The output has been saved into ./result.md
 ```
diff --git a/src/index.js b/src/index.js
index df91e2a..c27d731 100644
--- a/src/index.js
+++ b/src/index.js
@@ -19,11 +19,11 @@ program
   .name('treei')
   .version(package.version)
   .description('Generate a directory structure tree')
-  .option('-i, --ignore <ig>', 'ignore specific directory name')
+  .option('-i, --ignore <ig>', 'ignore specific directory name, separated by comma or \'|\'')
   .option('-d, --depth <depth>', 'specify the depth of output')
   .option('-f, --only-folder', 'output folder only')
   .option('--icon', 'output emoji icon, prefixing filename or directory')
-  .option('-o, --output <output>', 'export content into a file')
+  .option('-o, --output <output>', 'export content into a file, appending mode by default')
   .parse(process.argv)
 
 const options = program.opts()