diff --git a/doc/files/mods/spawn_usher/spawnusher.html b/doc/files/mods/spawn_usher/spawnusher.html
index 605e91c..cf43ddd 100644
--- a/doc/files/mods/spawn_usher/spawnusher.html
+++ b/doc/files/mods/spawn_usher/spawnusher.html
@@ -68,7 +68,7 @@
 <table class="function_list">
 
     <tr>
-    <td class="name" nowrap><a href="#spawnusher.activate">spawnusher.activate</a>&nbsp;(require_air_bubble_size, retry_time)</td>
+    <td class="name" nowrap><a href="#spawnusher.activate">spawnusher.activate</a>&nbsp;(required_air_bubble_size, retry_time)</td>
     <td class="summary">Activates the spawn usher system.</td>
     </tr>
 
@@ -110,7 +110,7 @@
 
 
 
-<dt><a name="spawnusher.activate"></a><strong>spawnusher.activate</strong>&nbsp;(require_air_bubble_size, retry_time)</dt>
+<dt><a name="spawnusher.activate"></a><strong>spawnusher.activate</strong>&nbsp;(required_air_bubble_size, retry_time)</dt>
 <dd>
 Activates the spawn usher system. 
 
@@ -119,7 +119,7 @@ Activates the spawn usher system.
 <ul>
 	
 	<li>
-	  require_air_bubble_size: Optional. The size/height of the bubble of air that is required for the player to spawn. Defaults to 2.
+	  required_air_bubble_size: Optional. The size/height of the bubble of air that is required for the player to spawn. Defaults to 2.
 	</li>
 	
 	<li>
diff --git a/mods/spawn_usher/spawnusher.lua b/mods/spawn_usher/spawnusher.lua
index 5dcd92d..f167c06 100644
--- a/mods/spawn_usher/spawnusher.lua
+++ b/mods/spawn_usher/spawnusher.lua
@@ -45,12 +45,15 @@ spawnusher = {
 
 --- Activates the spawn usher system.
 --
--- @param require_air_bubble_size Optional. The size/height of the bubble of air
---                                that is required for the player to spawn.
---                                Defaults to 2.
+-- @param required_air_bubble_size Optional. The size/height of the bubble of air
+--                                 that is required for the player to spawn.
+--                                 Defaults to 2.
 -- @param retry_time Optional. This is the time that passes between tries to
 --                   place to the player.
-function spawnusher.activate(require_air_bubble_size, retry_time)
+function spawnusher.activate(required_air_bubble_size, retry_time)
+	spawnusher.required_bubble_size = required_bubble_size or 2
+	spawnusher.retry_time = retry_time or 0.5
+	
 	minetest.register_on_newplayer(spawnusher.move_player)
 	minetest.register_on_respawnplayer(spawnusher.move_player)
 end