- To copy text from another X window, use the ``cut'' or ``copy'' command
-of the program operating the other window, to select the text you want.
-Then yank it in Emacs with @kbd{C-y} or @kbd{Mouse-2}.
+ To copy text from another X window, use the ``cut'' or ``copy''
+command of the program operating the other window, to select the text
+you want. Then yank it in Emacs with @kbd{C-y} or @kbd{Mouse-2}.
+
+ The standard coding system for X selections is @code{compound-text}.
+To specify another coding system for X selections, use @kbd{C-x
+@key{RET} x} or @kbd{C-x @key{RET} X}. @xref{Specify Coding}.