patch 7.4.1070
Problem:    The Tcl interface can't be loaded dynamically on Unix.
Solution:   Make it possible to load it dynamically. (Ken Takata)
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index a17cf71..8cf2aa7 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -7437,6 +7437,17 @@
 	Resetting this option is useful when using a ":tag" command in a
 	mapping which should not change the tagstack.
 
+						*'tcldll'*
+'tcldll' 		string	(default depends on the build)
+			global
+			{not in Vi}
+			{only available when compiled with the |+tcl/dyn|
+			feature}
+	Specifies the name of the Tcl shared library. The default is
+	DYNAMIC_TCL_DLL, which was specified at compile time.
+	This option cannot be set from a |modeline| or in the |sandbox|, for
+	security reasons.
+
 						*'term'* *E529* *E530* *E531*
 'term'			string	(default is $TERM, if that fails:
 				      in the GUI: "builtin_gui"