Added \label{} for logical addressing.
diff --git a/Doc/lib/libstrings.tex b/Doc/lib/libstrings.tex
index 411e415..6f2e705 100644
--- a/Doc/lib/libstrings.tex
+++ b/Doc/lib/libstrings.tex
@@ -1,4 +1,5 @@
 \chapter{String Services}
+\label{strings}
 
 The modules described in this chapter provide a wide range of string
 manipulation operations.  Here's an overview: