diff --git a/CHANGELOG b/CHANGELOG
index f26a30db93ada720a4161142cc0b702bd19e8fde..00667adc4f614bf53e99dd8984032ca85ca82200 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,6 @@
+5.5.1
+* Tidy up on repository (removing unused code and add basic documentation)
+
 5.5.0
 * Implement new calibration approach using polynomial approximation (all 
 the calibration code is now included on this module ) [[ICSHWI-5826]]