diff --git a/Manuals/Tcpi-ug/Configurations.ent b/Manuals/Tcpi-ug/Configurations.ent
index 394b70a..edb3787 100755
--- a/Manuals/Tcpi-ug/Configurations.ent
+++ b/Manuals/Tcpi-ug/Configurations.ent
@@ -1,3 +1,4 @@
-<!ENTITY configurations                 SYSTEM "Configurations.docbook">
-<!ENTITY configurations-ppp             SYSTEM "Configurations/Ppp.docbook">
-<!ENTITY configurations-ppp-overview    SYSTEM "Configurations/Ppp/overview.docbook">
+<!ENTITY configurations             SYSTEM "Configurations.docbook">
+<!ENTITY configurations-ppp         SYSTEM "Configurations/Ppp.docbook">
+<!ENTITY configurations-ppp-intro   SYSTEM "Configurations/Ppp/intro.docbook">
+<!ENTITY configurations-ppp-modem   SYSTEM "Configurations/Ppp/modem.docbook">