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-rw-r--r--man/groff_diff.man4
1 files changed, 4 insertions, 0 deletions
diff --git a/man/groff_diff.man b/man/groff_diff.man
index 45c76a0d..047b983e 100644
--- a/man/groff_diff.man
+++ b/man/groff_diff.man
@@ -1599,6 +1599,10 @@ Use the
request to map the encoding used in hyphenation patterns files to
.BR groff 's
input encoding.
+.
+By default, everything maps to itself except letters `A' to `Z' which
+map to `a' to `z'.
+.
.IP
The set of hyphenation patterns is associated with the current language
set by the