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+# Changelog
+
+## version 0.4.1
+
+- R/chent.R: Improve print method for `pai` objects.
+
+## version 0.4.0
+
+- R/chent.R: PubChem has changed the names of the SMILES codes they
+  provide. The former isomeric smiles that was incorporated in our chent
+  objects as “Pubchem_Isomeric” is now simply calles SMILES, and is
+  incorporated in our objects as “PubChem”. The SMILES code formerly
+  given as “canonical” is now termed “connectivity SMILES” because it
+  does not contain isotopic or stereochemical specifications. In the
+  chents object, it is now available under the name
+  “PubChem_Connectivity”. This is a breaking change, so objects
+  generated with versions \< 0.4.0 may produce errors when used with
+  current versions.
+
+## version 0.3.7
+
+- R/chent.R: Do not attempt to load a chyaml file per default, as the
+  format of such a file and the resulting chyaml list object is not
+  documented and would need to be inferred from its use in the pfm
+  package.
+
+## version 0.3.6
+
+- R/chent.R: Set the fields `smiles`, `inchikey` and `mw` to NA if these
+  fields are still NULL at the end of the initialization, with `source`
+  attribute set to “user”, assuming that the initialisation was
+  carefully done and `pubchem` and `rdkit` were skipped because the
+  structure is not well-defined.
+
+Please refer to the ChangeLog for commit messages up to November 2021,
+where I changed the GNUmakefile not to include commit messages in that
+file any more.