add syntax explanation in vim tuto file

tutos/vim.txt

@@ -1,9 +1,3 @@
-/SYNTAX/
-to create a new syntax file, just copy an existing one :
-	cp /usr/share/vim/vimXX/syntax/extension.vim ~/.vim/syntax/
-and change the name to match the extension
-and change the content to whatever you want
-
 /MODE INSERTION/
 **i** mode insertion avant le curseur
 **I** mode insertion au debut de la ligne
@@ -150,4 +144,12 @@ replacement2:	**vim old %** va a la toute premiere occurence de 'old'
 			tres important pour que la fonction se réecrive a chaque
 			fois, sinon conflit
 
+/SET SYNTAX FOR A FILE WITH EXTENSION NOT RECOGNIZE/
+/in case the syntax already exist/
+/like .tpp files with same syntax than .hpp, that have same syntax than .cpp/
+/.hpp files are detected but not .tpp files/
+**:set syntax=cpp** say to use cpp syntax
+**in .vimrc :**	filetype on
+				au BufNewFile,BufRead *.tpp set filetype=cpp
+