diff --git a/Doc/tutorial_05.docu b/Doc/tutorial_05.docu
index c7d38fea..fd64d255 100644
--- a/Doc/tutorial_05.docu
+++ b/Doc/tutorial_05.docu
@@ -132,7 +132,7 @@ Added properties can be released by the following functions:
 <li>release_vertex_texcoords()</li>
 </ul>
 
-A properties existance can be tested with
+A property's existance can be tested with
 
 <ul>
 <li>has_edge_status()</li>