svn:ignore

Hello, all

I can't seem to understand the usage of the svn:ignore
property. I have a directory DIR with a file file.txt in
it, which I want ignored. I entered DIR, and typed:

  svn propset svn:ignore file.txt .
  svn ci .

Now, when I modify file.txt, svn still detects the
modification and has no problem commiting it. What am I
doing wrong?

I expect that it will ignore changes to file.txt. If not,
what is the purpose of svn:ignore?

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