diff --git a/ClearURLs for uBo/clear_urls_uboified.txt b/ClearURLs for uBo/clear_urls_uboified.txt
index e3e3836cc..9b464d3ea 100644
--- a/ClearURLs for uBo/clear_urls_uboified.txt	
+++ b/ClearURLs for uBo/clear_urls_uboified.txt	
@@ -1,10 +1,10 @@
 ! Title: ClearURLs for uBo - List extension
 ! Homepage: https://github.com/DandelionSprout/adfilt/discussions/163
-! Last updated: 07/11/2021
+! Last updated: 09/11/2021
 ! Expires: 1 day
 ! Licence: https://github.com/DandelionSprout/adfilt/blob/master/LICENSE.md
 ! Note: This was based off of https://gist.github.com/rusty-snake/5cd83a87d680ecbd03e79a1a06758207, which is based off of https://github.com/ClearURLs/Rules. The maintainers of Adfilt (DandelionSprout and iam-py-test, and contributors) have made some modifications as to keep it up-to-date with the source and to fix issues
-! IMPORTANT NOTE: Do not modify this file. This file is autogenerated and therefore any direct edit to it will be undone. Instead, modifications must be made to https://github.com/DandelionSprout/adfilt/blob/master/ClearURLs%20for%20uBo/compile.py or to the upstream ClearURLs rules
+! IMPORTANT NOTE: Do not modify this file. This file is autogenerated and therefore any direct edit to it will be undone. Instead, modifications must be made to https://github.com/DandelionSprout/adfilt/blob/master/ClearURLs%20for%20uBo/compile.py or to the upstream ClearURLs rules. If you experience an issue, please report it to https://github.com/DandelionSprout/adfilt/discussions/163, and we (the Adfilt maintainers and community) will look into it and either add an exclusion or report it to the ClearURLs team 
 
 $removeparam=/^p[fd]_rd_[a-z]*=/,domain=amazon.*
 $removeparam=qid,domain=amazon.*
diff --git a/ClearURLs for uBo/compile.py b/ClearURLs for uBo/compile.py
index 89639c879..aca9e4a1d 100644
--- a/ClearURLs for uBo/compile.py	
+++ b/ClearURLs for uBo/compile.py	
@@ -23,6 +23,7 @@
 
 import json
 import sys
+import hashlib
 from datetime import date
 from typing import IO
 
@@ -35,7 +36,7 @@ HEAD = """\
 ! Expires: 1 day
 ! Licence: https://github.com/DandelionSprout/adfilt/blob/master/LICENSE.md
 ! Note: This was based off of https://gist.github.com/rusty-snake/5cd83a87d680ecbd03e79a1a06758207, which is based off of https://github.com/ClearURLs/Rules. The maintainers of Adfilt (DandelionSprout and iam-py-test, and contributors) have made some modifications as to keep it up-to-date with the source and to fix issues
-! IMPORTANT NOTE: Do not modify this file. This file is autogenerated and therefore any direct edit to it will be undone. Instead, modifications must be made to https://github.com/DandelionSprout/adfilt/blob/master/ClearURLs%20for%20uBo/compile.py or to the upstream ClearURLs rules
+! IMPORTANT NOTE: Do not modify this file. This file is autogenerated and therefore any direct edit to it will be undone. Instead, modifications must be made to https://github.com/DandelionSprout/adfilt/blob/master/ClearURLs%20for%20uBo/compile.py or to the upstream ClearURLs rules. If you experience an issue, please report it to https://github.com/DandelionSprout/adfilt/discussions/163, and we (the Adfilt maintainers and community) will look into it and either add an exclusion or report it to the ClearURLs team 
 
 """
 KNOWN_BAD_FILTERS = [
@@ -135,9 +136,28 @@ def getrules() -> str:
     RULES = "https://raw.githubusercontent.com/ClearURLs/Rules/master/data.min.json"
     return requests.get(RULES).text
 
+def haschanged() -> bool:
+    c = False
+    try:
+        hashes = json.loads(open("hash.txt").read())
+    except:
+        hashes = []
+    toph = hashlib.sha256(HEAD.encode()).hexdigest()
+    if toph not in hashes:
+        c = True
+    ruleshash = hashlib.sha256(getrules().encode()).hexdigest()
+    if ruleshash not in hashes:
+        c = True
+    with open("hash.txt","w") as rulesf:
+        rulesf.write(json.dumps([toph,ruleshash]))
+        rulesf.close()
+    return c
 
 def main() -> int:
     data_min_json = json.loads(getrules())
+    if haschanged() == False:
+        print("No change in rules. Exiting...")
+        sys.exit()
     filterlist = open("clear_urls_uboified.txt", "w")
     filterlist.write(HEAD.format(date=date.today().strftime("%d/%m/%Y")))
 
diff --git a/ClearURLs for uBo/hash.txt b/ClearURLs for uBo/hash.txt
new file mode 100644
index 000000000..42d6e0997
--- /dev/null
+++ b/ClearURLs for uBo/hash.txt	
@@ -0,0 +1 @@
+["ddfdb898086c2c8451f7ac7d596f0468f0efc5863c4d1a3e3496829ef15a62bf", "a02393e204e697dc1a40b7215ab6eaec85c5c217b381c89d6f46e832cd3d2398"]
\ No newline at end of file