text that turns binary further on has no content, like an image

1 files changed, 4 insertions, 4 deletions

diff --git a/docs/design.md b/docs/design.md
index 6b94fc8..4fa5b4a 100644
--- a/docs/design.md
+++ b/docs/design.md
@@ -204,9 +204,9 @@ cannot read the file (over `max-read`, a tool missing, failing or timing
 out), the exclude holds, and the file is set aside as "(content
 unreadable)" with the warning. A file whose format has no text at all (an
 image, an archive) is not unreadable: it contains no keyword, so its
-content tests are simply false and raise no warning. A file of no known
-extension that starts as text and holds binary data further on is
-unreadable. An exclude protects files, so a file krino
+content tests are simply false and raise no warning. So is a file of no
+known extension that starts as text and holds binary data further on, such
+as a self-extracting installer. An exclude protects files, so a file krino
 could not check is left alone. Mistakes in krino.conf's excludes are
 reported even while no directory is included.
 
@@ -324,7 +324,7 @@ Nothing is deleted, and undo restores them.
 
 | Format | Method |
 |---|---|
-| text | known text extensions, or detected from the first 8 KiB: valid UTF-8, or UTF-16 with a BOM, and no NUL bytes. A file detected as text that holds a NUL or invalid UTF-8 further on cannot be read (§4.6, §5.4) |
+| text | known text extensions; any other file whose first 8 KiB start with a UTF-16 BOM, or are valid UTF-8 with no NUL byte and so is the rest of it (one that turns binary further on, like a self-extracting installer, has no content) |
 | pdf | `pdftotext -q -enc UTF-8 FILE -`, 30 s timeout |
 | docx xlsx pptx odt ods odp epub | zip plus streaming XML, Go standard library |
 | html xml | tags removed, entities decoded |