[Bug #1562583] Mention the set_reuse_addr() method

Doc/lib/libasyncore.tex

@@ -198,9 +198,11 @@ Most of these are nearly identical to their socket partners.
 \end{methoddesc}
 
 \begin{methoddesc}{bind}{address}
-  Bind the socket to \var{address}.  The socket must not already
-  be bound.  (The format of \var{address} depends on the address
-  family --- see above.)
+  Bind the socket to \var{address}.  The socket must not already be
+  bound.  (The format of \var{address} depends on the address family
+  --- see above.)  To mark the socket as re-usable (setting the
+  \constant{SO_REUSEADDR} option), call the \class{dispatcher}
+  object's \method{set_reuse_addr()} method.
 \end{methoddesc}
 
 \begin{methoddesc}{accept}{}