| Index: site/dev/design/pdftheory.md | 
| diff --git a/site/dev/design/pdftheory.md b/site/dev/design/pdftheory.md | 
| index 96b8dbe9c7f9e062471830bc0d60186af1bb9271..29ccf91e61125ba0747bbdf20e514f37a8f432b0 100644 | 
| --- a/site/dev/design/pdftheory.md | 
| +++ b/site/dev/design/pdftheory.md | 
| @@ -71,6 +71,8 @@ longer document with a bunch of other pages. | 
| PDF Objects and Document Structure | 
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|  | 
| + | 
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| **Background**: The PDF file format has a header, a set of objects and | 
| then a footer that contains a table of contents for all of the objects | 
| in the document (the cross-reference table). The table of contents | 
|  |