diff -r 424b5b74a68f -r 9b6ded88d7a0 src/cx/iterator.h
--- a/src/cx/iterator.h	Fri Dec 20 16:53:46 2024 +0100
+++ b/src/cx/iterator.h	Fri Dec 20 16:55:23 2024 +0100
@@ -42,6 +42,9 @@
 extern "C" {
 #endif
 
+/**
+ * Common data for all iterators.
+ */
 struct cx_iterator_base_s {
     /**
      * True iff the iterator points to valid data.
@@ -92,6 +95,9 @@
  * Internal iterator struct - use CxIterator.
  */
 struct cx_iterator_s {
+    /**
+     * Inherited common data for all iterators.
+     */
     CX_ITERATOR_BASE;
 
     /**