diff --git a/phpBB/language/en/acp/common.php b/phpBB/language/en/acp/common.php
index 77dc5b6b62..c2c3fda7a0 100644
--- a/phpBB/language/en/acp/common.php
+++ b/phpBB/language/en/acp/common.php
@@ -308,7 +308,7 @@ $lang = array_merge($lang, array(
 
 	'SHOW_ALL_OPERATIONS'	=> 'Show all operations',
 
-	'TASKS_NOT_READY'			=> 'Not ready tasks:',
+	'TASKS_NOT_READY'		=> 'Not ready tasks:',
 	'TASKS_READY'			=> 'Ready tasks:',
 	'TOTAL_SIZE'			=> 'Total size',
 
diff --git a/phpBB/phpbb/console/command/thumbnail/delete.php b/phpBB/phpbb/console/command/thumbnail/delete.php
index 81f1baf1db..707c05ffea 100644
--- a/phpBB/phpbb/console/command/thumbnail/delete.php
+++ b/phpBB/phpbb/console/command/thumbnail/delete.php
@@ -61,7 +61,9 @@ class delete  extends \phpbb\console\command\command
 	/**
 	* Executes the command thumbnail:delete.
 	*
-	* @param InputInterface $input The input stream used to get the argument and verboe option.
+	* Delete all the existing thumbnails (and update the database in consequences).
+	*
+	* @param InputInterface $input The input stream used to get the argument and verbose option.
 	* @param OutputInterface $output The output stream, used for printing verbose-mode and error information.
 	*
 	* @return int 0 if all is ok, 1 if a thumbnail couldn't be deleted.
diff --git a/phpBB/phpbb/console/command/thumbnail/generate.php b/phpBB/phpbb/console/command/thumbnail/generate.php
index dcf60e4fe2..bbe6677650 100644
--- a/phpBB/phpbb/console/command/thumbnail/generate.php
+++ b/phpBB/phpbb/console/command/thumbnail/generate.php
@@ -74,6 +74,8 @@ class generate extends \phpbb\console\command\command
 	/**
 	* Executes the command thumbnail:generate.
 	*
+	* Generate a thumbnail for all attachments which need one and don't have it yet.
+	*
 	* @param InputInterface $input The input stream used to get the argument and verboe option.
 	* @param OutputInterface $output The output stream, used for printing verbose-mode and error information.
 	*
diff --git a/phpBB/phpbb/console/command/thumbnail/recreate.php b/phpBB/phpbb/console/command/thumbnail/recreate.php
index 569642f2a4..71c5d90654 100644
--- a/phpBB/phpbb/console/command/thumbnail/recreate.php
+++ b/phpBB/phpbb/console/command/thumbnail/recreate.php
@@ -48,6 +48,8 @@ class recreate  extends \phpbb\console\command\command
 	/**
 	* Executes the command thumbnail:recreate.
 	*
+	* This command is a "macro" to execute thumbnail:delete and then thumbnail:generate.
+	*
 	* @param InputInterface $input The input stream used to get the argument and verboe option.
 	* @param OutputInterface $output The output stream, used for printing verbose-mode and error information.
 	*