; * src/lisp.h (struct Lisp_Overlay): Update commentary (bug#64580).

src/lisp.h

@@ -2594,20 +2594,14 @@ struct Lisp_Marker
   ptrdiff_t bytepos;
 } GCALIGNED_STRUCT;
 
-/* START and END are markers in the overlay's buffer, and
-   PLIST is the overlay's property list.  */
 struct Lisp_Overlay
 /* An overlay's real data content is:
    - plist
-   - buffer (really there are two buffer pointers, one per marker,
+   - buffer
-     and both points to the same buffer)
+   - itree node
-   - insertion type of both ends (per-marker fields)
+   - start buffer position (field of the itree node)
-   - start & start byte (of start marker)
+   - end buffer position (field of the itree node)
-   - end & end byte (of end marker)
+   - insertion types of both ends (fields of the itree node).  */
-   - next (singly linked list of overlays)
-   - next fields of start and end markers (singly linked list of markers).
-   I.e. 9words plus 2 bits, 3words of which are for external linked lists.
-*/
   {
     union vectorlike_header header;
     Lisp_Object plist;