diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index 2911c070..80b4825e 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -2258,7 +2258,7 @@ class Net_SSH2
     /**
      * Execute Command
      *
-     * If $block is set to false then Net_SSH2::_get_channel_packet(NET_SSH2_CHANNEL_EXEC) will need to be called manually.
+     * If $callback is set to false then Net_SSH2::_get_channel_packet(NET_SSH2_CHANNEL_EXEC) will need to be called manually.
      * In all likelihood, this is not a feature you want to be taking advantage of.
      *
      * @param String $command