diff --git a/docs/ansible.posix.acl_module.rst b/docs/ansible.posix.acl_module.rst
index 07fa743..2b47f98 100644
--- a/docs/ansible.posix.acl_module.rst
+++ b/docs/ansible.posix.acl_module.rst
@@ -157,7 +157,7 @@ Parameters
                 <td>
                 </td>
                 <td>
-                        <div>The permissions to apply/remove can be any combination of <code>r</code>, <code>w</code> and <code>x</code> (read, write and execute respectively)</div>
+                        <div>The permissions to apply/remove can be any combination of <code>r</code>, <code>w</code>, <code>x</code> (read, write and execute respectively), and <code>X</code> (execute permission if the file is a directory or already has execute permission for some user)</div>
                 </td>
             </tr>
             <tr>
diff --git a/plugins/modules/acl.py b/plugins/modules/acl.py
index 38ff294..bacf6a5 100644
--- a/plugins/modules/acl.py
+++ b/plugins/modules/acl.py
@@ -48,7 +48,7 @@ options:
     choices: [ group, mask, other, user ]
   permissions:
     description:
-    - The permissions to apply/remove can be any combination of C(r), C(w) and C(x) (read, write and execute respectively)
+    - The permissions to apply/remove can be any combination of C(r), C(w), C(x) (read, write and execute respectively), and C(X) (execute permission if the file is a directory or already has execute permission for some user)
   entry:
     description:
     - DEPRECATED.