Blame SOURCES/README.usr

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This directory /usr/share/pki/ca-trust-source/ contains CA certificates and 
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trust settings in the PEM file format. The trust settings found here will be
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interpreted with a low priority - lower than the ones found in 
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/etc/pki/ca-trust/source/ .
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=============================================================================
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QUICK HELP: To add a certificate in the simple PEM or DER file formats to the
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            list of CAs trusted on the system:
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            Copy it to the
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                    /usr/share/pki/ca-trust-source/anchors/
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            subdirectory, and run the
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                    update-ca-trust
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            command.
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            If your certificate is in the extended BEGIN TRUSTED file format,
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            then place it into the main source/ directory instead.
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=============================================================================
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Please refer to the update-ca-trust(8) manual page for additional information.