Adjusted to use the new module synopsis support macros.
diff --git a/Doc/lib/libsignal.tex b/Doc/lib/libsignal.tex
index 4a8b3b4..86d6967 100644
--- a/Doc/lib/libsignal.tex
+++ b/Doc/lib/libsignal.tex
@@ -1,7 +1,9 @@
\section{Built-in Module \module{signal}}
-\label{module-signal}
+\declaremodule{builtin}{signal}
-\bimodindex{signal}
+
+\modulesynopsis{Set handlers for asynchronous events.}
+
This module provides mechanisms to use signal handlers in Python.
Some general rules for working with signals handlers: