kc3-lang/kc3

diff --git a/doc/1_KC3/1.03_Str.en.md b/doc/1_KC3/1.03_Str.en.md
index 28ec116..9bc7c43 100644
--- a/doc/1_KC3/1.03_Str.en.md
+++ b/doc/1_KC3/1.03_Str.en.md
@@ -6,10 +6,12 @@ checked according to their size and are NUL terminated.
 
 ## 1.03.1 String litterals and interpolation
 
-A string litteral starts with either double quotes `"` or 
-Inside of a string litteral you can use the `#{expr}` to evaluate
-expr to a Str inside of the litteral. The string litteral is then
-parsed as a Call to KC3.str .
+A string litteral starts and ends with double quotes `"`
+or triple quotes `"""` and inside of a string litteral you can use
+the `#{expr}` syntax to evaluate expr to a Str inside of the litteral.
+The string litteral is then parsed as a `Call` to `KC3.str` and not an
+actual `Str`. At evaluation the arguments to the call and `KC3.str`
+gets called concatenating at once all the parts to a new `Str`.
 
 ## 1.03.2 Examples