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diff --git a/tex/context/base/mkiv/typo-pnc.mkiv b/tex/context/base/mkiv/typo-pnc.mkiv
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+%D \module
+%D   [       file=typo-pnc,
+%D        version=2017.06.23, % experiment in project
+%D          title=\CONTEXT\ Typesetting Macros,
+%D       subtitle=Punctuation,
+%D         author=Hans Hagen,
+%D           date=\currentdate,
+%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
+%C
+%C This module is part of the \CONTEXT\ macro||package and is
+%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
+%C details.
+
+\writestatus{loading}{ConTeXt Typesetting Macros / Punctuation}
+
+\unprotect
+
+% In manuals we often have "foo e.g. bar" where we then have to compensate spaces
+% with "foo e.g.\ bar" so let's see if we can automate that and at the same time
+% inject spaces between the snippets. It gets boring writing this kind of code.
+
+\registerctxluafile{typo-pnc}{}
+
+\definesystemattribute[periodkern][public,global]
+
+\installcorenamespace{periodkerning}
+
+\installcommandhandler \??periodkerning {periodkerning} \??periodkerning
+
+\unexpanded\def\setperiodkerning[#1]%
+  {\edef\currentperiodkerning{#1}%
+   \ifx\currentperiodkerning\s!reset
+     \resetperiodkerning
+   \else
+     \typo_periodkerning_set
+   \fi}
+
+\def\typo_periodkerning_set
+  {\clf_setperiodkerning{\periodkerningparameter\c!factor}}
+
+\unexpanded\def\resetperiodkerning % fast one
+  {\attribute\periodkernattribute\attributeunsetvalue}
+
+\appendtoks
+    \resetperiodkerning
+\to \everyresettypesetting
+
+\defineperiodkerning [zerospaceperiods]  [\c!factor=0]
+\defineperiodkerning [smallspaceperiods] [\c!factor=.25]
+\defineperiodkerning [halfspaceperiods]  [\c!factor=.5]
+
+% If we ever need a command, see typo-krn.mkiv but it doesn't make much sense
+% to have it.
+
+\protect