man tracker-search page says -e is --folders but also --emails

Man page quotes:

       -e, --folders=EXPRESSION
              Search for folders matching EXPRESSION (optional).
...

      -e, --emails=EXPRESSION
              Search for emails matching EXPRESSION (optional). Returns a list of subjects for emails found.

$ tracker-search -e somedir
  E-mails:

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: tracker 0.12.10-1
ProcVersionSignature: Ubuntu 3.2.0-18.28-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 1.94.1-0ubuntu1
Architecture: amd64
CheckboxSubmission: 1b338cfaff551fea83bf0c1f06969438
CheckboxSystem: d00f84de8a555815fa1c4660280da308
Date: Sun Mar 11 08:34:55 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
SourcePackage: tracker
UpgradeStatus: No upgrade log present (probably fresh install)