diff --git a/flask/helpers.py b/flask/helpers.py
index cfc2d408..28771a98 100644
--- a/flask/helpers.py
+++ b/flask/helpers.py
@@ -959,7 +959,15 @@ def total_seconds(td):
     """
     return td.days * 60 * 60 * 24 + td.seconds
 
-def is_IP(string):
+def is_IP(string, var_name):
+    """Returns the if the string received is an IP or not.
+
+    :param string: the string to check if it an IP or not
+    :param var_name: the name of the variable that is being checked
+
+    :returns: True if string is an IP, False if not
+    :rtype: boolean
+    """
     ipv4 = string.split('.')
     ipv6 = string.split(':')
     try:
@@ -967,7 +975,7 @@ def is_IP(string):
             if not t:
                 ipv6[i] = "0"
         if(all(int(t,16) >= 0 and int(t,16) <= 65535 for t in ipv6)):
-            print("IPv6 address introduced in SESSION_COOKIE_DOMAIN!")
+            print("IPv6 address introduced in " + var_name)
             return True
     except ValueError:
         pass
@@ -975,7 +983,7 @@ def is_IP(string):
     if len(ipv4) == 4:
         try:
             if(all(int(t) >= 0 and int(t) <= 255 for t in ipv4)):
-                print("IPv4 address introduced in SESSION_COOKIE_DOMAIN!")
+                print("IPv4 address introduced in " + var_name)
         except ValueError:
             return False
     else:
diff --git a/flask/sessions.py b/flask/sessions.py
index 86283f25..c7468832 100644
--- a/flask/sessions.py
+++ b/flask/sessions.py
@@ -332,7 +332,7 @@ class SecureCookieSessionInterface(SessionInterface):
 
     def save_session(self, app, session, response):
         domain = self.get_cookie_domain(app)
-        is_IP(domain)
+        is_IP(domain, "SESSION_COOKIE_DOMAIN")
         path = self.get_cookie_path(app)
 
         # Delete case.  If there is no session we bail early.