diff --git a/ReleaseNotes.md b/ReleaseNotes.md
index 2b37b8df..6d537165 100644
--- a/ReleaseNotes.md
+++ b/ReleaseNotes.md
@@ -5,9 +5,11 @@ Given here are some release notes for NJOY2016. Each release is made through a f
 This update fixes the following issues:
   - GROUPR output now correctly distinguishes between level numbers and isomeric numbers when extracting nuclide production.
   - LEAPR now sets the EMAX value in MF1 MT451 to be equal to the B(4) value in MF7 MT4.
+  - PURR now uses quicksort instead of bubble sort, which leads to a significant speedup in this module. This change should have no effect on the values of the probability table.
 
 In addition, this update added the following features and changes:
   - Added optional card9a to GROUPR to support extracting MF=9 and MF=10 production channels with resulting level numbers greater than 9.
+  - Two group structures were added to GROUPR (the apollo 99-group structure and the ecco 1962-group structure). The shem epm 295-group structure and shem cea/epm 361-group structure were updated as well.
 
 ## [NJOY2016.78](https://github.com/njoy/NJOY2016/pull/361)
 This update fixes the following issues: