schema tree DOC update comment
diff --git a/src/tree_schema.h b/src/tree_schema.h
index 8499a76..61b4c22 100644
--- a/src/tree_schema.h
+++ b/src/tree_schema.h
@@ -747,7 +747,9 @@
::lysp_node_leaf/::lysc_node_leaf and ::lysp_node_anydata/::lysc_node_anydata.
This flag is present only in case the mandatory false statement was explicitly specified. */
#define LYS_MAND_MASK 0x60 /**< mask for mandatory values */
-#define LYS_PRESENCE 0x80 /**< flag for presence property of a container, applicable only to ::lysc_node_container */
+#define LYS_PRESENCE 0x80 /**< flag for presence property of a container, but it is not only for explicit presence
+ containers, but also for NP containers with some meaning, applicable only to
+ ::lysc_node_container */
#define LYS_UNIQUE 0x80 /**< flag for leafs being part of a unique set, applicable only to ::lysc_node_leaf */
#define LYS_KEY 0x100 /**< flag for leafs being a key of a list, applicable only to ::lysc_node_leaf */
#define LYS_KEYLESS 0x200 /**< flag for list without any key, applicable only to ::lysc_node_list */