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diff --git a/sys/man/1/sed b/sys/man/1/sed
old mode 100755
new mode 100644
index 6bb2e6123..e057b7192
--- a/sys/man/1/sed
+++ b/sys/man/1/sed
@@ -255,6 +255,30 @@ Append the pattern space to
 if a replacement
 was made.
 .RE
+.IP
+An ampersand 
+.L &
+appearing in the replacement
+is replaced by the string matching the regular expression.
+The characters
+.BI \e n\f1,
+where
+.I n
+is a digit,
+are replaced by the text matched by the
+.IR n -th
+regular subexpression
+enclosed between
+.L (
+and
+.LR ) .
+When
+nested parenthesized subexpressions
+are present,
+.I n
+is determined by counting occurrences of
+.L (
+starting from the left.
 .TP
 .BI t " label"
 Test.