diff --git a/docs/peek.1 b/docs/peek.1
index bb32f3b..9ec336c 100644
--- a/docs/peek.1
+++ b/docs/peek.1
@@ -11,7 +11,7 @@ peek \(en read from the standard input, furtively
 .SH SYNOPSIS
 
 peek
-.RB ( -i )
+.RB [ -i ]
 .\"
 .SH DESCRIPTION