diff --git a/documentation/modules/auxiliary/client/mms/send_mms.md b/documentation/modules/auxiliary/client/mms/send_mms.md
index 4be2ef46d8..f675585dd1 100644
--- a/documentation/modules/auxiliary/client/mms/send_mms.md
+++ b/documentation/modules/auxiliary/client/mms/send_mms.md
@@ -67,7 +67,8 @@ The password you use to log into the SMTP server.
 
 **SMTPFROM**
 
-The FROM field of SMTP. In some cases, it may be used as ```SMTPUSER```.
+The FROM field of SMTP. In some cases, it may be used as ```SMTPUSER```. Some carriers require this
+in order to receive the text, such as AT&T.
 
 **MMSSUBJECT**