diff --git a/README b/README
index 7580477..bece1e4 100644
--- a/README
+++ b/README
@@ -8,12 +8,17 @@ This project plans to create a clone of HP RPN calculator language,
 including at least stack, store, branch, test, trig and logs commands
 of HP28S RPL implementation.
 
-Following objects are managed: scalars, symbols, binaries, strings,
- programs.
-Scalar are in 128-bit quadruple precision format (long double).
+Following objects are managed: numbers, binaries, symbols, strings,
+ programs, plus keywords (ie langage commands and flow controls).
+
+The special feature of this language is to make no difference between
+keywords and functions, even user functions.
+
+Numbers (ie scalars) are in 128-bit quadruple precision format (long
+double).
 Binaries are 64-bits longwords format (long long int).
 
-An interactive editor with autocompletion is provided (readline-based).
+A GNU-readline-based interactive editor with autocompletion is provided.
 
 Language extensions will soon be included:
 - file objects and functions,