In "Source Code Management" I choose Subversion and entered several urls.

when i commit a new change, it is writes it in the change log when i run a build, but if i "update to revision" the build just updates the file and doesn't add it to the change log.
Even if i delete the entire working copy folder, it creates the folder again with all the file but the changelog is empty.
any idea why?

Steps to reproduce :

1. select in "Source Code Management" Subversion .
2. enter a URL of a subversion repository.
3. run the build.
4. in C:\Jenkins\jobs\<YourJob>\builds\<YourBuild>\changelog.xml you will see only <log/>