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-rw-r--r--docs/fs.md7
1 files changed, 6 insertions, 1 deletions
diff --git a/docs/fs.md b/docs/fs.md
index 8464768b..af64fded 100644
--- a/docs/fs.md
+++ b/docs/fs.md
@@ -733,7 +733,12 @@ unanchored branches (`^def|x`) is refused, `bad regular expression`, since
mvzr keeps `^` only first. A pattern may be up to 512 of mvzr's operations,
about 512 characters (mvzr's own is 64; pardes builds it with more); a
longer one is refused, `bad regular expression: longer than mvzr's 512
-operations`. An expression is
+operations`. A class may hold non-ASCII runes (`[éa-z]`, `[à-ÿ]`): it is
+taken as an alternation of them (`(é|[a-z])`), a range of up to 256 runes
+spelled out, and the 512 counts the pattern as rewritten. A wider range
+(`a range of runes wider than 256 in [...] is not supported`) and a negated
+class with a non-ASCII rune (`[^é]`) are refused, since mvzr's classes hold
+bytes. An expression is
evaluated from the current address, the range last written to `addr` (or
left by the last `data` write, just past it), as acme evaluates it from
`w->addr` (xfid.c:446): `.` is that address, not the selection (`dot` is