diff --git a/doc/sample/Person.im b/doc/sample/Person.im
index 6b27d14..b0daf84 100755
--- a/doc/sample/Person.im
+++ b/doc/sample/Person.im
@@ -542,9 +542,9 @@ p1 = do
 end.
 
 
-v = 'Hello'.
+v = "Hello".
 if v is String then
-    cout put:'v is a string!'
+    cout put:"v is a string!"
 end
 
 /******************************************************************************/