diff --git a/lib/behat/classes/behat_command.php b/lib/behat/classes/behat_command.php
index bbff7bc28e6..4112e3cf620 100644
--- a/lib/behat/classes/behat_command.php
+++ b/lib/behat/classes/behat_command.php
@@ -177,7 +177,7 @@ class behat_command {
     }
 
     /**
-     * Has the site installed composer with --dev option
+     * Has the site installed composer.
      * @return bool
      */
     public static function are_behat_dependencies_installed() {
diff --git a/lib/phpunit/bootstraplib.php b/lib/phpunit/bootstraplib.php
index 9e02f21a2fb..a9640994bfd 100644
--- a/lib/phpunit/bootstraplib.php
+++ b/lib/phpunit/bootstraplib.php
@@ -50,7 +50,7 @@ function phpunit_bootstrap_error($errorcode, $text = '') {
             $text = 'Error: '.$text;
             break;
         case PHPUNIT_EXITCODE_PHPUNITMISSING:
-            $text = "Can not find PHPUnit library, to install use: php composer.phar install --dev";
+            $text = "Can not find PHPUnit library, to install use: php composer.phar install";
             break;
         case PHPUNIT_EXITCODE_PHPUNITWRONG:
             $text = 'Moodle requires PHPUnit 3.6.x, '.$text.' is not compatible';
diff --git a/lib/phpunit/readme.md b/lib/phpunit/readme.md
index 69bcdf08834..b15b96e1422 100644
--- a/lib/phpunit/readme.md
+++ b/lib/phpunit/readme.md
@@ -15,7 +15,7 @@ Composer is a dependency manager for PHP projects.
 It installs PHP libraries into /vendor/ subdirectory inside your moodle dirroot.
 
 1. install Composer - [http://getcomposer.org/doc/00-intro.md](http://getcomposer.org/doc/00-intro.md)
-2. install PHUnit and dependencies - go to your Moodle dirroot and execute `php composer.phar install --dev`
+2. install PHUnit and dependencies - go to your Moodle dirroot and execute `php composer.phar install`
 
 
 Configure your server
@@ -53,4 +53,4 @@ How to add more tests?
 
 Windows support
 ---------------
-* use `\` instead of `/` in paths in examples above
\ No newline at end of file
+* use `\` instead of `/` in paths in examples above
diff --git a/lib/testing/lib.php b/lib/testing/lib.php
index 04bf85cd5db..96bd5ba168e 100644
--- a/lib/testing/lib.php
+++ b/lib/testing/lib.php
@@ -169,8 +169,6 @@ function testing_error($errorcode, $text = '') {
 /**
  * Updates the composer installer and the dependencies.
  *
- * Includes --dev dependencies.
- *
  * @return void exit() if something goes wrong
  */
 function testing_update_composer_dependencies() {