diff --git a/Manuals/Tcar-ug/Introduction.ent b/Manuals/Tcar-ug/Introduction.ent
index 86feba0..4dd1f4e 100644
--- a/Manuals/Tcar-ug/Introduction.ent
+++ b/Manuals/Tcar-ug/Introduction.ent
@@ -1,3 +1,4 @@
-<!ENTITY intro                    SYSTEM "Introduction.docbook">
-<!ENTITY intro-docconvs           SYSTEM "Introduction/Docconvs.docbook">
-<!ENTITY intro-feedback           SYSTEM "Introduction/Feedback.docbook">
+<!ENTITY intro              SYSTEM "Introduction.docbook">
+<!ENTITY intro-history      SYSTEM "Introduction/history.docbook">
+<!ENTITY intro-docconvs     SYSTEM "Introduction/Docconvs.docbook">
+<!ENTITY intro-feedback     SYSTEM "Introduction/Feedback.docbook">