diff --git a/README.md b/README.md
index 1eb42e6..a2d1394 100644
--- a/README.md
+++ b/README.md
@@ -71,7 +71,7 @@ getAddress.autocomplete(
             residential:'residential'  /* The id of the element bound to 'residential' */
           },
           id_prefix:'getAddress-autocomplete' ,  /* The id of the textbox and list container */
-          css_prefix?:'getAddress_autocomplete'",  /* The class name prefix */
+          css_prefix:'getAddress_autocomplete',  /* The class name prefix */
           delay:200, /* millisecond delay between keypress and API call */
           minimum_characters:2,  /* minimum characters to initiate an API call */
           clear_list_on_select:true, /* if true, clears list on suggestion selected */