diff --git a/README.md b/README.md
index b0e4701..22a73ab 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,21 @@ or
 wget -O -  https://get.acme.sh | sh
 ```
 
+### Install Options
+
+See https://github.com/Neilpang/acme.sh/wiki/Options-and-Params for available options.
+
+```
+curl https://get.acme.sh | ACME_USE_WGET=1 HTTPS_INSECURE=1 sh -s -- --home /opt/acme.sh --noprofile
+
+```
+
+or
+
+```
+wget -O -  https://get.acme.sh | HTTPS_INSECURE=1 sh -s -- --home /opt/acme.sh --noprofile
+```
+
 ## 2. Advanced Installation:
 
 https://github.com/Neilpang/acme.sh/wiki/How-to-install
diff --git a/index.html b/index.html
index f85ab94..d0da853 100644
--- a/index.html
+++ b/index.html
@@ -9,19 +9,44 @@
     return 1
   fi
   if type command >/dev/null 2>&1 ; then
-    command -v $cmd >/dev/null 2>&1
+    command -v "$cmd" >/dev/null 2>&1
   else
-    type $cmd >/dev/null 2>&1
+    type "$cmd" >/dev/null 2>&1
   fi
-  ret="$?"
-  return $ret
+  return "$?"
 }
 
-if _exists curl && [ "${ACME_USE_WGET:-0}" = "0" ]; then
-  curl https://raw.githubusercontent.com/Neilpang/acme.sh/master/acme.sh | INSTALLONLINE=1  sh
+_truthy() {
+  val="$(echo "$1" | tr '[:upper:]' '[:lower:]')"
+  [ -n "$val" ] && [ "$val" != 0 ] && [ "$val" != false ]
+}
+
+if _truthy "$HTTPS_INSECURE"; then
+  _CURL_OPTS="--insecure"
+  _WGET_OPTS="--no-check-certificate"
+else
+  _CURL_OPTS=
+  _WGET_OPTS=
+fi
+
+if _truthy "$ACME_USE_WGET"; then
+  _USE_WGET=1
+else
+  _USE_WGET=0
+fi
+
+_ACME="https://raw.githubusercontent.com/Neilpang/acme.sh/master/acme.sh"
+_CURL="curl $_CURL_OPTS $_ACME"
+_WGET="wget $_WGET_OPTS -O - $_ACME"
+
+if _exists curl && [ -z "$_USE_WGET" ]; then
+  _CMND="$_CURL"
 elif _exists wget ; then
-  wget -O -  https://raw.githubusercontent.com/Neilpang/acme.sh/master/acme.sh | INSTALLONLINE=1  sh
+  _CMND="$_WGET"
 else
   echo "Sorry, you must have curl or wget installed first."
   echo "Please install either of them and try again."
+  exit 2
 fi
+
+$_CMND | ACME_USE_WGET=$_USE_WGET INSTALLONLINE=1 sh -s -- "$@"