prepend

To attach to the beginning of data. For example, a header is "prepended" to a network packet. Although it sounds correct, prepend is not an English word. It was created to sound like the opposite of "append," which means to add to the end. The correct English word is "prefix;" for example, "the header is prefixed to the packet." See prefix.

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[by analogy with ‘append’] To prefix. As with ‘append’ (but not ‘prefix’ or ‘suffix’ as a verb), the direct object is always the thing being added and not the original word (or character string, or whatever). “If you prepend a semicolon to the line, the translation routine will pass it through unaltered.”