diff --git a/docs/manual.sgml b/docs/manual.sgml
index e30808e40f2e819b1556a8b1ad8523e967ed5a10..65705f6ba6d9e6df84d14cb0d83fa125e3069ca4 100644
--- a/docs/manual.sgml
+++ b/docs/manual.sgml
@@ -28,6 +28,7 @@
 <!ENTITY nextgen SYSTEM "next_gen.sgml">
 
 <!ENTITY % artemis-only "INCLUDE">
+<!ENTITY % act-only "IGNORE">
 
 <!ENTITY prog "Artemis">
 <!ENTITY art "Artemis">