diff --git a/README.md b/README.md
index d6b8ed2f..29926844 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,5 @@
 # An ACME Shell script: acme.sh
 - An ACME protocol client written purely in Shell (Unix shell) language.
-- It's `sh` compatible, not only `bash`.
 - Fully ACME protocol implementation.
 - Simple, powerful and very easy to use. You only need 3 minutes to learn.
 
diff --git a/acme.sh b/acme.sh
index c569e4b6..7d3b30c0 100755
--- a/acme.sh
+++ b/acme.sh
@@ -1225,7 +1225,7 @@ issue() {
         dnsadded='0'
         txtdomain="_acme-challenge.$d"
         _debug txtdomain "$txtdomain"
-        txt="$(echo -e -n $keyauthorization | _digest "sha256" | _urlencode)"
+        txt="$(echo -n $keyauthorization | _digest "sha256" | _urlencode)"
         _debug txt "$txt"
         #dns
         #1. check use api