diff --git a/doc/source/signature.rst b/doc/source/signature.rst
index c6ca4e0b15..38ea596557 100644
--- a/doc/source/signature.rst
+++ b/doc/source/signature.rst
@@ -135,10 +135,13 @@ Get an image and create the signature::
 
   $ openssl dgst -sha256 -sign private_key.pem -sigopt rsa_padding_mode:pss -out myimage.signature myimage
 
-  $ base64 myimage.signature > myimage.signature.b64
+  $ base64 -w 0 myimage.signature > myimage.signature.b64
 
   $ image_signature=$(cat myimage.signature.b64)
 
+.. note:: Using Glance v1 requires '-w 0' due to not supporting multiline image properties.
+          Glance v2 does support multiline image properties and does not require '-w 0' but may still be used.
+
 Create the image::
 
   $ glance image-create --name mySignedImage --container-format bare --disk-format qcow2 --property img_signature="$image_signature" --property img_signature_certificate_uuid="$cert_uuid" --property img_signature_hash_method='SHA-256' --property img_signature_key_type='RSA-PSS' < myimage