[...] the most common kinds of affixes are of course prefixes (parallel to clitics preceding the phrase-final elements) and suffixes (parallel to clitics following the phrase-final elements). Infixes such as Tagalog "-um-" in "gumabi" "get on toward nighttime" (cf. "gabi" "night") are analogous to second-position clitics: They are located with respect to the beginning of the phonological phrase within which they appear [...], but they follow this anchor point.
- Anderson (2004), Pag. 43