diff --git a/docs/tech/tn0015.txt b/docs/tech/tn0015.txt
index 2279894bce..5575d2de90 100644
--- a/docs/tech/tn0015.txt
+++ b/docs/tech/tn0015.txt
@@ -21,7 +21,7 @@ when adding new bitmap/icon.
 
 First of all, you have to add new wxArtID constant to include/wx/artprov.h.
 Look for "Art IDs" and add new definition to the list, e.g.
-    #define wxART_MY_BITMAP     _T("my_bitmap")
+    #define wxART_MY_BITMAP     wxART_MAKE_ART_ID(wxART_MY_BITMAP)
     
 Add it to docs/latex/wx/artprov.tex, too.
 
@@ -30,8 +30,7 @@ of defined client categories (search for "Art clients" in the header). In case
 the new resource is part of a larger category, you need to define a new
 client. Just add it to the list of existing clients (and don't forget to
 update artprov.tex):
-    #define wxART_MY_CLIENT _T("my_client_C")
-(Note that you *have* to add the trailing "_C"!)
+    #define wxART_MY_CLIENT wxART_MAKE_CLIENT_ID(wxART_MY_CLIENT)
 
 Alternatively, you may use wxART_OTHER when accessing the resource if the
 bitmap is standalone.