I use biblatex with verbose-trad2 style and when I make a reference with a prenote ended with a dot i'd like it to see displayed "Ibid" with first letter capitalized as it is the case when there is no prenote. The example bellow explains the difference :

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    Welcome to TeX.SE! Please give us more informations: Which documentclass do you use, which packages related to bibliography, which relevant options? Best would be a complete compilable code, a minimal working example (MWE). Don't forget to add two bib entries ...
    – Mensch
    Sep 7 '15 at 16:51
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    Try \footcite[Ipsum.\bibsentence][Lorem]{sigfridsson}. biblatex does differentiate between abbreviation dots and full stops (sentence end dots). With the standard setting \DeclareFieldFormat{prenote}{#1\isdot} all .s in the pre-note are treated as abbreviation dots and thus do not trigger capitalisation (this is presumably because often a pre-note might read "Cf." or so). If you want a . to always be a full stop in the pre-note you can use \DeclareFieldFormat{prenote}{#1}.
    – moewe
    Sep 7 '15 at 17:13

This is a feature of biblatex's punctuation tracker. A . can have two meanings for biblatex. It is either a dot to signify abbreviations or a full stop (period) to indicate the end of a sentence.

A . is treated as a full stop by default; this behaviour can be reversed by issuing \isdot, then a preceding . is treated as an abbreviation dot.

In the prenote formatting (biblatex.def) we find


So all . in a pre-note are seen as abbreviation dots, which makes sense since a prenote often contains a short abbreviation such as "Cf." or just a short word such as "see", but rarely an entire sentence.

There are two solutions here. One is a temporary solution in which you tell biblatex to capitalise the next word anyway


The second solution will globally switch the behaviour in prenotes to recognise . as full stops.


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