diff --git a/How-to-install.md b/How-to-install.md
index 3c89358..6dbf377 100644
--- a/How-to-install.md
+++ b/How-to-install.md
@@ -58,7 +58,7 @@ Explanations :
 - `--home` is a customized dir to install `acme.sh` in.  By default, it installs into `~/.acme.sh` 
 - `--config-home` is a writable folder, acme.sh will write all the files(including cert/keys, configs) there. By default, it's in `--home`
 - `--cert-home` is a customized dir to save the certs you issue.  By default, it's saved in `--config-home`.
-- `--m` is the email used to register an account to Let's Encrypt,  you will receive a renewal notice email here. Default is empty.
+- `--m` is the email used to register an account to Let's Encrypt,  you will receive a renewal notice email here.
 - `--accountkey` is the file saving your account private key.  By default, it's saved in `--config-home`.
 - `--user-agent`  is the user-agent header value used to send to Let's Encrypt.