Also accept system keyword in record fields

1 files changed, 12 insertions, 5 deletions

diff --git a/README.md b/README.md
index a0e90e9..3c02a28 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ This is a fork to implement experimental new features.
 1\. [Syntactic sugar](#1-syntactic-sugar)  
 1.1. [Lambda-case](#11-lambda-case)  
 2\. [Syntax changes](#2-syntax-changes)  
-2.1. [Use of the `module` keyword](#21-use-of-the-module-keyword)  
+2.1. [Use of module header keywords](#21-use-of-module-header-keywords)  
 
 ---
 
@@ -52,16 +52,23 @@ LambdaAbstr = ...
 
 ## 2. Syntax changes
 
-### 2.1. Use of the `module` keyword
+### 2.1. Use of module header keywords
 
-The `module` keyword is only a keyword on the topmost level. This allows for
-using it as a record field, for example:
+Four keywords are now only recognised on the topmost level. This allows for
+using them as a record field, for example:
 
 ```clean
 :: MyType = { module :: Int }
 ```
 
-However, it is not allowed to define a function named `module`.
+The keywords are:
+
+ - `module`
+ - `definition`
+ - `implementation`
+ - `system`
+
+It is not allowed to define a function named as one of these keywords.
 
 [clean]: http://clean.cs.ru.nl
 [cocl]: https://svn.cs.ru.nl/repos/clean-compiler/