diff --git a/raiden_contracts/constants.py b/raiden_contracts/constants.py
index bc4e39041..c84c2f93a 100644
--- a/raiden_contracts/constants.py
+++ b/raiden_contracts/constants.py
@@ -7,7 +7,7 @@
 
 from raiden_contracts.utils.type_aliases import ChainID
 
-# Do not change this, this is handled by bumpversion with .bumpversion_contracts.cfg
+# The last digit is supposed to be zero always. See `RELEASE.rst`.
 CONTRACTS_VERSION = "0.33.0"
 
 PRECOMPILED_DATA_FIELDS = ["abi", "bin", "bin-runtime", "metadata"]