Added \label{} for logical addressing.
diff --git a/Doc/libcrypto.tex b/Doc/libcrypto.tex
index a04c849..e81404c 100644
--- a/Doc/libcrypto.tex
+++ b/Doc/libcrypto.tex
@@ -1,4 +1,5 @@
 \chapter{Cryptographic Services}
+\label{crypto}
 \index{cryptography}
 
 The modules described in this chapter implement various algorithms of