--- a/src/cx/tree.h	Mon Nov 24 22:38:50 2025 +0100
+++ b/src/cx/tree.h	Mon Nov 24 22:39:18 2025 +0100
@@ -88,6 +88,7 @@
     ptrdiff_t loc_next;
     /**
      * The total number of distinct nodes that have been passed so far.
+     * This includes the current node.
      */
     size_t counter;
     /**
@@ -185,6 +186,7 @@
     ptrdiff_t loc_next;
     /**
      * The total number of distinct nodes that have been passed so far.
+     * This includes the currently visited node.
      */
     size_t counter;
     /**