Use gadt for function catalog

1 files changed, 10 insertions, 8 deletions

diff --git a/readme.rst b/readme.rst
index a41c0c0..970817e 100755
--- a/readme.rst
+++ b/readme.rst
@@ -148,14 +148,13 @@ garanted to not loop.)
 Range
 ~~~~~
 
-Yan can reference a range by naming the two bounds (`C6:A1`). The value is
-typed as a List.
+Yan can reference a range by naming the two bounds (`C6:A1`).
 
 Undefined
 ~~~~~~~~~
 
-If a reference point to an an empty cell, the content will be interpreted as Undefined
-
+If a reference point to an an empty cell, the content will be interpreted as
+Undefined. Any formula impliyng Undefined will return Error
 
 Formulas
 ========
@@ -168,12 +167,16 @@ Licht is provided with built-in functions.
 Generic comparaison
 -------------------
 
-Thoses function can be applied to any value, they will never raise error
+Thoses function can be applied to any value.
 
 =============== ===============================
 Function        Value
 =============== ===============================
 *x* `=` *y*     True if *x* equals *y*
+*x* `>` *y*     True if *x* > *y*
+*x* `>=` *y*    True if *x* >= *y*
+*x* `<` *y*     True if *x* < *y*
+*x* `<=` *y*    True if *x* <= *y*
 *x* `<>` *y*    True if *x* does not equals *y*
 =============== ===============================
 
@@ -192,12 +195,11 @@ Function        Value
 Numeric
 -------
 
-In numeric functions, Undefined_ value are considered as `O`
-
 =================== =====================================
 Function            Value
 =================== =====================================
-`sum(Numeric List)` Compute the sum of the list.
 *x* `+` *y*         Add two values
 *x* `**` *y*        Compute *x* ^ *y*
+`sum(Numeric List)` Compute the sum of the list.
+`rnd()`             A random number between 0 and 1
 =================== =====================================