diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index e137c47e..d172f4cf 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 ## 1.0.0
+### 1.0.0-rc.124
+This is an UNSTABLE release. This version significantly rewrites code to predict reflection position and integrate them, 
+especially in case of rotation crystallography. If things go wrong with analysis, it is better to revert to 1.0.0-rc.123.
+
+* jfjoch_broker: Improve refection position prediction and Bragg integration code.
+* jfjoch_broker: Align with XDS way of calculating Lorentz correction and general notation.
+* jfjoch_writer: Fix saving mosaicity properly in HDF5 file.
+
 ### 1.0.0-rc.123
 This is an UNSTABLE release.