diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 8cc30f4c30..857e9de7b6 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1347,6 +1347,8 @@ pref("javascript.options.dynamicImport", true);
 
 // Streams API
 pref("javascript.options.streams", true);
+
+// Enable garbage collection of weakrefed objects
 pref("javascript.options.weakrefs", false);
 
 // advanced prefs