diff --git a/tamper/charunicodeencode.py b/tamper/charunicodeencode.py
index 309907859..a76bf47a6 100644
--- a/tamper/charunicodeencode.py
+++ b/tamper/charunicodeencode.py
@@ -7,14 +7,16 @@ Copyright (c) 2006-2011 sqlmap developers (http://www.sqlmap.org/)
 See the file 'doc/COPYING' for copying permission
 """
 
+import os
 import string
 
 from lib.core.enums import PRIORITY
+from lib.core.common import singleTimeWarnMessage
 
 __priority__ = PRIORITY.LOWEST
 
 def dependencies():
-    pass
+    singleTimeWarnMessage("tamper script '%s' is only meant to be run against ASP or ASP.NET web applications" % os.path.basename(__file__).split(".")[0])
 
 def tamper(payload):
     """
@@ -25,9 +27,15 @@ def tamper(payload):
         * Input: SELECT FIELD%20FROM TABLE
         * Output: %u0053%u0045%u004c%u0045%u0043%u0054%u0020%u0046%u0049%u0045%u004c%u0044%u0020%u0046%u0052%u004f%u004d%u0020%u0054%u0041%u0042%u004c%u0045'
 
+    Requirement:
+        * ASP
+        * ASP.NET
+
     Tested against:
         * Microsoft SQL Server 2000
         * Microsoft SQL Server 2005
+        * MySQL 5.1.56
+        * PostgreSQL 9.0.3
 
     Notes:
         * Useful to bypass weak web application firewalls that do not