diff --git a/README.md b/README.md
index d198c5b..5d2143c 100644
--- a/README.md
+++ b/README.md
@@ -18,9 +18,9 @@ A list of the PHP packages to install (OS-specific by default). You'll likely wa
 
 _Note: If you're using Debian/Ubuntu, you also need to install `libapache2-mod-fastcgi` (for cgi/PHP-FPM) or `libapache2-mod-php7.0` (or a similar package depending on PHP version) if you want to use `mod_php` with Apache._
 
-    additional_php_packages: []
-    
-A list of additional PHP packages to install without overriding the default.
+    php_packages_extra: []
+
+A list of extra PHP packages to install without overriding the default list.
 
     php_enable_webserver: true
 
diff --git a/tasks/main.yml b/tasks/main.yml
index b1062ee..5afcce8 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -8,10 +8,10 @@
     php_packages: "{{ __php_packages | list }}"
   when: php_packages is not defined
 
-- name: Define additional php_packages.
+- name: Define extra php_packages.
   set_fact:
-    php_packages: "{{ php_packages | list + additional_php_packages | list }}"
-  when: additional_php_packages is defined
+    php_packages: "{{ php_packages | list + php_packages_extra | list }}"
+  when: php_packages_extra is defined
 
 - name: Define php_webserver_daemon.
   set_fact: