+The behaviour of @code{require} when called with only one argument is
+implementation-defined. In SBCL, @code{require} behaves in the
+following way:
+
+@include fun-common-lisp-require.texinfo
+@include var-sb-ext-star-module-provider-functions-star.texinfo
+
+Although SBCL does not provide a resident editor, the @code{ed}
+function can be customized to hook into user-provided editing
+mechanisms as follows:
+
+@include fun-common-lisp-ed.texinfo
+@include var-sb-ext-star-ed-functions-star.texinfo