diff --git a/_fc-plugins/acsl-importer.md b/_fc-plugins/acsl-importer.md
index 0efbaf349b4fae7a0b2c1572d2e18abff6222414..ddc922a578389413a2b2a56b39b3e5bfc1d77e3c 100644
--- a/_fc-plugins/acsl-importer.md
+++ b/_fc-plugins/acsl-importer.md
@@ -75,6 +75,13 @@ void job ( int *t , int A) {
 and a specification file:
 
 ```
+module demo :
+ axiomatic A {
+ type event = B | C(integer);
+ predicate P(integer x);
+ logic integer phi(event e);
+ }
+ 
 function f:
   contract:
     ensures P(phi(C(\result)));