diff --git a/Sandbox/Required-fields link test.md b/Sandbox/Required-fields link test.md
index 21a5503c8..f7d73d1fb 100644
--- a/Sandbox/Required-fields link test.md	
+++ b/Sandbox/Required-fields link test.md	
@@ -1 +1,3 @@
 [Button test 3](https://subscribe.adblockplus.org/?location=https://raw.githubusercontent.com/DandelionSprout/adfilt/master/Username%2520Hider%2520for%2520Compilation%2520Creators.txt&title=Username%20Hider%20for%20Compilation%20Creators&requiresLocation=https://raw.githubusercontent.com/lassekongo83/Frellwits-filter-lists/master/Frellwits-Swedish-Filter.txt&requiresTitle=JohnMadden)
+
+[Button test 4](https://subscribe.adblockplus.org/?location=https://raw.githubusercontent.com/DandelionSprout/adfilt/master/Sandbox/FilterlistsWidthProofOfConcept.txt&title=aeiou)