diff --git a/src/js/contentscript-end.js b/src/js/contentscript-end.js
index 6b936018d..82ce59fc7 100644
--- a/src/js/contentscript-end.js
+++ b/src/js/contentscript-end.js
@@ -47,6 +47,7 @@ if ( vAPI.canExecuteContentScript() !== true ) {
     return;
 }
 
+// https://github.com/gorhill/uBlock/issues/587
 // Pointless to execute without the start script having done its job.
 if ( !vAPI.contentscriptStartInjected ) {
     return;
diff --git a/src/js/contentscript-start.js b/src/js/contentscript-start.js
index 83166b21e..a190ef25e 100644
--- a/src/js/contentscript-start.js
+++ b/src/js/contentscript-start.js
@@ -144,6 +144,7 @@ var filteringHandler = function(details) {
         // the browser to flush this script from memory.
     }
 
+    // https://github.com/gorhill/uBlock/issues/587
     // If no filters were found, maybe the script was injected before uBlock's
     // process was fully initialized. When this happens, pages won't be 
     // cleaned right after browser launch.