diff --git a/flask_mail.py b/flask_mail.py
index d0756e5..3ffeb15 100644
--- a/flask_mail.py
+++ b/flask_mail.py
@@ -62,8 +62,6 @@ def force_text(s, encoding='utf-8', errors='strict'):
     """
     Similar to smart_text, except that lazy instances are resolved to
     strings, rather than kept as lazy objects.
-
-    If strings_only is True, don't convert (some) non-string-like objects.
     """
     if isinstance(s, text_type):
         return s
@@ -85,10 +83,10 @@ def force_text(s, encoding='utf-8', errors='strict'):
         if not isinstance(s, Exception):
             raise FlaskMailUnicodeDecodeError(s, *e.args)
         else:
-            s = ' '.join([force_text(arg, encoding, strings_only,
-                    errors) for arg in s])
+            s = ' '.join([force_text(arg, encoding, errors) for arg in s])
     return s
 
+
 def sanitize_subject(subject, encoding='utf-8'):
     try:
         subject.encode('ascii')
@@ -99,6 +97,7 @@ def sanitize_subject(subject, encoding='utf-8'):
             subject = Header(subject, 'utf-8').encode()
     return subject
 
+
 def sanitize_address(addr, encoding='utf-8'):
     if isinstance(addr, string_types):
         addr = parseaddr(force_text(addr))
@@ -131,6 +130,7 @@ def _has_newline(line):
         return True
     return False
 
+
 class Connection(object):
     """Handles connection to host."""
 
@@ -175,8 +175,8 @@ def send(self, message, envelope_from=None):
         assert message.send_to, "No recipients have been added"
 
         assert message.sender, (
-                "The message does not specify a sender and a default sender "
-                "has not been configured")
+            "The message does not specify a sender and a default sender "
+            "has not been configured")
 
         if message.has_bad_headers():
             raise BadHeaderError