diff --git a/doc/release_notes.qbk b/doc/release_notes.qbk
index 86d0b8743..1138591ea 100644
--- a/doc/release_notes.qbk
+++ b/doc/release_notes.qbk
@@ -54,6 +54,7 @@
 * Bug in buffers for joins with a imited number of points
 * Bug in buffers for joins with large buffer distances
 * Bug in closing iterator not working properly when the input range is empty
+* Bug in is_simple, not handling properly closed simple linestrings within multilinestrings
 
 [/=================]
 [heading Boost 1.57]