Update...

Update 00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/05.first-steps/textbook.en.md

00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/05.first-steps/textbook.en.md

@@ -33,18 +33,33 @@ in level 2).
 
 #### To participate
 
+<!----------------------
 To **add a math element** to a level :
   * classify it in the corresponding chapter (and if necessary create a new chapter)    
     (example: numeration, sets, geometry, ...)
-    
   * write your proposal, and end on the same line with three initials XXX identifying you + your native language (ES, FR or EN), all in brackets.   
     (example: (XXX-FR)).
+----------------------->
+    
+To **add a new proposal or a new point in a proposal**    
+
+* Start your contribution with three initials XXX identifying you + your native language (ES, FR or EN), all in brackets.   
+    (example: (XXX-FR)).
 
+<!---------------------
 To **react to an existing proposal** :
    * after the element, add your comment (following the other comments)
 starting with three initials XXX identifying you + your native language (ES, FR or EN), add your comment after the others
 starting with three initials in parenthesis you represent, all in parenthesis.   
     (example: (XXX-FR)).
+---------------------->
+
+To **react to a point in an existing proposal** 
+
+* add your comment (following the other comments)
+starting with three initials XXX identifying you + your native language (ES, FR or EN), all in brackets.   
+    (example: (XXX-FR)).
+
 
 #### Where to contribute?