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diff --git a/CHANGELOG.md b/CHANGELOG.md
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@@ -12,7 +12,9 @@
and `and`/`or`/`not` combine unknowns by three-valued logic. A rule never
matches on an unknown, so `(not (content "x"))` no longer acts on a file
krino could not read; an exclude holds on an unknown only when the text
- could change its answer; `explain` shows `?`. A document read only in part
+ could change its answer; `explain` shows `?`. `(matched)` is unknown
+ while no earlier rule matched but one could not be decided, so a
+ `(not (matched))` catch-all leaves such a file alone. A document read only in part
answers the keywords found in what was read, and leaves the others
unknown; its answers are never cached, and keyword caches written by
0.0.7 are discarded.