diff --git a/README.md b/README.md
index 5e18027be92e49b5905b1cf976d221bf32cc3332..1bffdad250b362ee4e4d1bbae8605d08423a2981 100644
--- a/README.md
+++ b/README.md
@@ -85,8 +85,12 @@ Monitoring data are saved in `run['data'].monitoring_data` and can also accessed
 
 Dead pixel and pedestal information are read by `magic-cta-pipe` `MAGIC_Badpixels.py` class.
 
+##### MC Header data
+Some general information about the simulated data, useful for IRF calculation, are read from the root files and stored in data.mcheader container.
+
 #### Changelog
 
 - v0.1: Initial version
 - v0.2.0: Unification of data and MC reading
-- v0.2.1: Monitoring data (Dead pixel and pedestal information)
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+- v0.2.1: Monitoring data (Dead pixel and pedestal information)
+- v0.2.2: Added MC Header info
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