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-rw-r--r--bin/bit.y4
-rw-r--r--bin/man1/bit.15
2 files changed, 8 insertions, 1 deletions
diff --git a/bin/bit.y b/bin/bit.y
index 61b6f465..2b2ee27c 100644
--- a/bin/bit.y
+++ b/bin/bit.y
@@ -63,7 +63,9 @@ expr:
 	| expr 'G' { $$ = $1 << 30; }
 	| expr 'T' { $$ = $1 << 40; }
 	| '~' expr { $$ = ~$2; }
-	| '-' expr { $$ = -$2; }
+	| '&' expr %prec '~' { $$ = MASK($2); }
+	| '+' expr %prec '~' { $$ = +$2; }
+	| '-' expr %prec '~' { $$ = -$2; }
 	| expr '*' expr { $$ = $1 * $3; }
 	| expr '/' expr { $$ = $1 / $3; }
 	| expr '%' expr { $$ = $1 % $3; }
diff --git a/bin/man1/bit.1 b/bin/man1/bit.1
index 06fd182f..b91a10e1 100644
--- a/bin/man1/bit.1
+++ b/bin/man1/bit.1
@@ -27,6 +27,11 @@ The
 .Sy ->
 operator is used for arithmetic shift.
 .It
+The unary
+.Sy &
+operator is equivalent to
+.Sy (1 << x) - 1 .
+.It
 The postfix operators
 .Sy K ,
 .Sy M ,