diff -r 02adaa52d0c4 -r 5a7aa9cf9c3a src/cx/tree.h
--- a/src/cx/tree.h	Tue Oct 08 18:32:48 2024 +0200
+++ b/src/cx/tree.h	Tue Oct 08 18:47:45 2024 +0200
@@ -258,7 +258,7 @@
  * @param loc_children offset in the node struct for the children linked list
  * @param loc_last_child optional offset in the node struct for the pointer to
  * the last child in the linked list (negative if there is no such pointer)
- * @param loc_prev offset in the node struct for the prev pointer
+ * @param loc_prev optional offset in the node struct for the prev pointer
  * @param loc_next offset in the node struct for the next pointer
  * @see cx_tree_unlink()
  */
@@ -283,7 +283,7 @@
  * @param loc_children offset in the node struct for the children linked list
  * @param loc_last_child optional offset in the node struct for the pointer to
  * the last child in the linked list (negative if there is no such pointer)
- * @param loc_prev offset in the node struct for the prev pointer
+ * @param loc_prev optional offset in the node struct for the prev pointer
  * @param loc_next offset in the node struct for the next pointer
  * @see cx_tree_link()
  */
@@ -520,7 +520,7 @@
  * @param loc_children offset in the node struct for the children linked list
  * @param loc_last_child optional offset in the node struct for the pointer to
  * the last child in the linked list (negative if there is no such pointer)
- * @param loc_prev offset in the node struct for the prev pointer
+ * @param loc_prev optional offset in the node struct for the prev pointer
  * @param loc_next offset in the node struct for the next pointer
  * @return the number of nodes created and added
  * @see cx_tree_add()
@@ -573,7 +573,7 @@
  * @param loc_children offset in the node struct for the children linked list
  * @param loc_last_child optional offset in the node struct for the pointer to
  * the last child in the linked list (negative if there is no such pointer)
- * @param loc_prev offset in the node struct for the prev pointer
+ * @param loc_prev optional offset in the node struct for the prev pointer
  * @param loc_next offset in the node struct for the next pointer
  * @return the number of array elements successfully processed
  * @see cx_tree_add()
@@ -635,7 +635,7 @@
  * @param loc_children offset in the node struct for the children linked list
  * @param loc_last_child optional offset in the node struct for the pointer to
  * the last child in the linked list (negative if there is no such pointer)
- * @param loc_prev offset in the node struct for the prev pointer
+ * @param loc_prev optional offset in the node struct for the prev pointer
  * @param loc_next offset in the node struct for the next pointer
  * @return zero when a new node was created and added to the tree,
  * non-zero otherwise
@@ -865,7 +865,7 @@
  * @param loc_children offset in the node struct for the children linked list
  * @param loc_last_child optional offset in the node struct for the pointer to
  * the last child in the linked list (negative if there is no such pointer)
- * @param loc_prev offset in the node struct for the prev pointer
+ * @param loc_prev optional offset in the node struct for the prev pointer
  * @param loc_next offset in the node struct for the next pointer
  * @return the new tree
  * @see cxTreeCreateSimple()
@@ -932,7 +932,7 @@
  * @param loc_children offset in the node struct for the children linked list
  * @param loc_last_child optional offset in the node struct for the pointer to
  * the last child in the linked list (negative if there is no such pointer)
- * @param loc_prev offset in the node struct for the prev pointer
+ * @param loc_prev optional offset in the node struct for the prev pointer
  * @param loc_next offset in the node struct for the next pointer
  * @return the new tree
  * @see cxTreeCreate()