stat_item: add comment with struct overview
Related: OS#5088
Change-Id: Ic63a5884da778938197c658c5f478c23a85a4587
diff --git a/src/stat_item.c b/src/stat_item.c
index 31298fd..d4f3b72 100644
--- a/src/stat_item.c
+++ b/src/stat_item.c
@@ -52,6 +52,23 @@
*
*/
+/* Struct overview:
+ * Each osmo_stat_item is attached to an osmo_stat_item_group, which is
+ * attached to the global osmo_stat_item_groups list.
+ *
+ * osmo_stat_item_groups
+ * / \
+ * group1 group2
+ * / \
+ * item1 item2
+ * |
+ * values
+ * / \
+ * 1 2
+ * |-id |-id
+ * '-value '-value
+ */
+
#include <stdint.h>
#include <string.h>