diff --git a/README.md b/README.md
index a0dd448..16c0e5f 100644
--- a/README.md
+++ b/README.md
@@ -57,6 +57,7 @@ heise.de::TechStage |
 ## Misc
 - [tborychowski/miniflux-filter](https://github.com/tborychowski/miniflux-filter)
 - [jqplay.org](https://jqplay.org)
+- To clean up your `filter.txt` you can use the following script: `./sort_and_remove_double_lines.sh`
 
 ### Debug
 If `MF_DEBUG` is set to `1`, `miniflux-filter`  will print extra output to stdout.
diff --git a/sort_and_remove_double_entries.sh b/sort_and_remove_double_entries.sh
new file mode 100755
index 0000000..876c3b2
--- /dev/null
+++ b/sort_and_remove_double_entries.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+FILTERFILE=./filter.txt
+VORHER=$(wc -l < $FILTERFILE)
+echo Sortiere und filtere doppelte Zeilen heraus.
+sort filter.txt | uniq -u -i | cat > .tmp
+NACHHER=$(wc -l < .tmp)
+echo Es wurden $((VORHER-NACHHER)) Zeilen  entfernt!
+mv -f .tmp filter.txt