diff --git a/pmwiki_recipes/exercises.php b/pmwiki_recipes/exercises.php
index c2a49ff..76d54ba 100644
--- a/pmwiki_recipes/exercises.php
+++ b/pmwiki_recipes/exercises.php
@@ -5,19 +5,16 @@
 # still to implement (cf http://fabien.benetou.fr/Cookbook/Cognition#DailyExercisesFeed )
 #	is word X from page A, B, C or D?
 #	does page A contains word X, Y or Z?
-#	is page A linked to page B?
 #	what is the correct order for pages A, B and C on descending criteria i A>B>C? A>C>B? B>C>A? B>A>C? C>B>A? C>A>B?
 #		e.g. size, frequency update, last edition, ... 
 #	which of those page corresponds the updates visualization V, A, B or C? 
 #	keyword or URL in pages
 #	page linked to other page
-# to display, especially the current and past score in
-#	http://fabien.benetou.fr/Content/MentalExercises
-# display global or related to the current page, or group (based on parameters)
-# cf also early August discussion on ##pim
-#
-# update http://fabien.benetou.fr/MemoryRecalls/ImprovingPIM when it is working
-#	also push to the code repository
+# implemented
+#	is page A linked to page B?
+# consider a difficulty parameter
+#	should be linked to the counter
+#	e.g. increasing the number of possibilities (at least 1 out of 5 pages instead of at least 1 out of 3)
 
 
 $RecipeInfo['Exercises']['Version'] = '2011-12-08';