Photoshop adds "Software Adobe ImageReady" metadata

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http://superuser.com – So, I'm using Adobe Photoshop, but whenever I export an image as a png for web and devices, I get this junk in a tEXT chunk, Software Adobe ImageReady, even when metadata is set to None. I've been inserting these images into HTML as base64-inline images, and obviously this extra text is unnecessary bloat. Question: Is there any way to turn this off? I noticed it happens when exporting from Illustrator as well... p.s. If not, it's not a big deal... (HowTos)