[ci skip] Fix docs

1 files changed, 1 insertions, 1 deletions

diff --git a/io.c b/io.c
index 32704d9d17..3fe1f6eb16 100644
--- a/io.c
+++ b/io.c
@@ -7524,7 +7524,7 @@ static VALUE popen_finish(VALUE port, VALUE klass);
  *
  *  - <tt>cmd[0][0]</tt> (the first string in the nested array) is the name of a program that is run.
  *  - <tt>cmd[0][1]</tt> (the second string in the nested array) is set as the program's <tt>argv[0]</tt>.
- *  - <tt>cmd[1..-1] (the strings in the outer array) are the program's arguments.
+ *  - <tt>cmd[1..-1]</tt> (the strings in the outer array) are the program's arguments.
  *
  *  Example (sets <tt>$0</tt> to 'foo'):
  *