diff --git a/tamper/charencode.py b/tamper/charencode.py
index f58830f93..87ccd3f8f 100644
--- a/tamper/charencode.py
+++ b/tamper/charencode.py
@@ -1,11 +1,10 @@
 import re
 import string
 
-from lib.core.convert import urlencode
 from lib.core.exception import sqlmapUnsupportedFeatureException
 
 """
-value -> urlencode of nonencoded chars in value
+value -> urlencode of nonencoded chars in value (e.g., SELECT%20FIELD%20FROM%20TABLE -> %53%45%4c%45%43%54%20%46%49%45%4c%44%20%46%52%4f%4d%20%54%41%42%4c%45)
 """
 def tamper(place, value):
     retVal = value
diff --git a/tamper/doubleencode.py b/tamper/doubleencode.py
index 6b88c5489..6ca004b03 100644
--- a/tamper/doubleencode.py
+++ b/tamper/doubleencode.py
@@ -4,7 +4,7 @@ from lib.core.convert import urlencode
 from lib.core.exception import sqlmapUnsupportedFeatureException
 
 """
-Tampering value -> urlencode(value)
+Tampering value -> urlencode(value) (e.g., SELECT%20FIELD%20FROM%20TABLE -> SELECT%25%20FIELD%25%20FROM%25%20TABLE)
 """
 def tamper(place, value):
     if value:
diff --git a/tamper/dummy.py b/tamper/dummy.py
deleted file mode 100644
index a924869fb..000000000
--- a/tamper/dummy.py
+++ /dev/null
@@ -1,6 +0,0 @@
-def tamper(place, value):
-    print "Hi, World!"
-    print value
-    if place=="GET" and value:
-        value=value.upper()
-    return value
diff --git a/tamper/ifnull2ifisnull.py b/tamper/ifnull2ifisnull.py
index 7406b4723..df4fa4610 100644
--- a/tamper/ifnull2ifisnull.py
+++ b/tamper/ifnull2ifisnull.py
@@ -4,7 +4,7 @@ from lib.core.convert import urldecode
 from lib.core.convert import urlencode
 
 """
-IFNULL(A,B) -> IF(ISNULL(A),B,A)
+IFNULL(A,B) -> IF(ISNULL(A),B,A) (e.g., IFNULL(1,2) -> IF(ISNULL(1),2,1))
 """
 def tamper(place, value):
     if value and value.find("IFNULL") > -1:
diff --git a/tamper/randomcase.py b/tamper/randomcase.py
index 28b5f0a52..a0f73ca0b 100644
--- a/tamper/randomcase.py
+++ b/tamper/randomcase.py
@@ -1,12 +1,11 @@
 import re
 import string
 
-from lib.core.convert import urlencode
 from lib.core.common import randomRange
 from lib.core.exception import sqlmapUnsupportedFeatureException
 
 """
-value -> chars from value with random case
+value -> chars from value with random case (e.g., INSERT->InsERt)
 """
 def tamper(place, value):
     retVal = value
diff --git a/tamper/space2comment.py b/tamper/space2comment.py
index 8c9b1250a..6bbe76138 100644
--- a/tamper/space2comment.py
+++ b/tamper/space2comment.py
@@ -4,7 +4,7 @@ from lib.core.convert import urldecode
 from lib.core.convert import urlencode
 
 """
-' ' -> /**/
+' ' -> /**/ (e.g., SELECT id FROM users->SELECT/**/id/**/FROM users)
 """
 def tamper(place, value):
     if value: