Added \label{} for logical addressing.
diff --git a/Doc/lib/libobjs.tex b/Doc/lib/libobjs.tex
index ea6891a..450447b 100644
--- a/Doc/lib/libobjs.tex
+++ b/Doc/lib/libobjs.tex
@@ -1,4 +1,5 @@
 \chapter{Built-in Types, Exceptions and Functions}
+\label{builtin}
 
 \nodename{Built-in Objects}