Fixed #102755, thanks Drumm.

Fixed #102271, thanks incrn8.

captcha.module

@@ -62,6 +62,21 @@ function captcha_settings() {
     '#description' => t('Select what kind of challenge you want to pose to the user')
   );
 
+  $form['captcha_description'] = array(
+    '#type' => 'textfield',
+    '#title' => t('Additional response description text'),
+    '#default_value' => variable_get('captcha_description', ''),
+    '#description' => t('This text will be added below the captcha response field.'),
+  );
+
+  $form['captcha_override_module_description'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('Override module's form item description?'),
+    '#default_value' => variable_get('captcha_override_module_description', 0),
+    '#description' => t('Override the captcha module's form item description to the one set above.'),
+  );
+
+
   return $form;
 }
 
@@ -93,6 +108,17 @@ function captcha_form_alter($formid, &$form) {
       //use call_func because module_invoke does not allow call by reference.
       if (module_hook($captcha_type, 'captchachallenge')) {
         call_user_func_array($captcha_type.'_captchachallenge', array(&$form, &$_SESSION['captcha']));
+        if(variable_get('captcha_override_module_description', 0)) {
+          unset($form['captcha_response']['#description']);
+        }
+        if (strlen(variable_get('captcha_description', '')) > 0) {
+          if (isset($form['captcha_response']['#description'])) {
+            $form['captcha_response']['#description'] .= ' '. variable_get('captcha_description', '');
+          }
+          else {
+            $form['captcha_response']['#description'] = variable_get('captcha_description', '');
+          }
+        }
       }
     }
   }