diff --git a/core/misc/tabledrag.js b/core/misc/tabledrag.js
index 7fc8d64..04d59bb 100644
--- a/core/misc/tabledrag.js
+++ b/core/misc/tabledrag.js
@@ -58,7 +58,7 @@
     this.oldRowElement = null; // Remember the previous element.
     this.oldY = 0; // Used to determine up or down direction from last mouse move.
     this.changed = false; // Whether anything in the entire table has changed.
-    this.maxDepth = -1; // Maximum amount of allowed parenting.
+    this.maxDepth = -1; // Maximum amount of allowed parenting. -1 if unlimited.
     this.rtl = $(this.table).css('direction') === 'rtl' ? -1 : 1; // Direction of the table.
 
     // Configure the scroll settings.