Add description to tell how to use --from-clipboard option

README.md

@@ -18,14 +18,14 @@ brew install nakabonne/pbgopy/pbgopy
 #### RHEL/CentOS
 
 ```
-rpm -ivh https://github.com/nakabonne/pbgopy/releases/download/v0.2.0/pbgopy_0.2.0_linux_amd64.rpm
+rpm -ivh https://github.com/nakabonne/pbgopy/releases/download/v0.2.1/pbgopy_0.2.1_linux_amd64.rpm
 ```
 
 #### Debian/Ubuntu
 
 ```
-wget https://github.com/nakabonne/pbgopy/releases/download/v0.2.0/pbgopy_0.2.0_linux_amd64.deb
-apt install ./pbgopy_0.2.0_linux_amd64.deb
+wget https://github.com/nakabonne/pbgopy/releases/download/v0.2.1/pbgopy_0.2.1_linux_amd64.deb
+apt install ./pbgopy_0.2.1_linux_amd64.deb
 ```
 
 #### Arch Linux
@@ -76,9 +76,10 @@ export PBGOPY_SERVER=http://host.xz:9090
 pbgopy paste >foo.png
 ```
 
+## Options
 
 ### End-to-end encryption
-`pbgopy` comes with a built-in ability to encrypt/decrypt with a common key, hence allows you to perform end-to-end encryption without working with external tools.
+`pbgopy` comes with a built-in ability to encrypt/decrypt with a common key derived from password. Hence allows you to perform end-to-end encryption without working with external tools.
 
 ```bash
 pbgopy copy -p your-password <secret.txt
@@ -90,8 +91,10 @@ Then decrypt with the same password:
 pbgopy paste -p your-password
 ```
 
+Alternatively, the `PBGOPY_PASSWORD_FILE` environment variable is available for automating password entry.
+
 ### Authentication
-You can perform a minimum of authentication via an HTTP Basic Authentication.
+HTTP Basic Authentication is available with `-a` flag.
 
 ```bash
 pbgopy serve -a user:pass
@@ -112,6 +115,13 @@ You can set TTL for the cache. Give `0s` for disabling it. Default is `24h`.
 pbgopy serve --ttl 10m
 ```
 
+### From clipboard on your OS
+You can put the data stored at the clipboard on your OS into pbgopy server.
+
+```bash
+pbgopy copy -c
+```
+
 ## Inspired By
 - [nwtgck/piping-server](https://github.com/nwtgck/piping-server)
 - [bradwood/glsnip](https://github.com/bradwood/glsnip)

commands/copy.go

@@ -43,7 +43,7 @@ func NewCopyCommand(stdout, stderr io.Writer) *cobra.Command {
 	cmd.Flags().StringVarP(&r.password, "password", "p", "", "Password for encryption/decryption")
 	cmd.Flags().StringVarP(&r.basicAuth, "basic-auth", "a", "", "Basic authentication, username:password")
 	cmd.Flags().StringVar(&r.maxBufSize, "max-size", "500mb", "Max data size with unit")
-	cmd.Flags().BoolVarP(&r.fromClipboard, "from-clipboard", "c", false, "Put the data stored at clipboard into pbgopy server")
+	cmd.Flags().BoolVarP(&r.fromClipboard, "from-clipboard", "c", false, "Put the data stored at local clipboard into pbgopy server")
 	return cmd
 }