-The \fBhas_key\fR routine takes a key value from the above list, and
-returns TRUE or FALSE according to whether
+A few of these predefined values do \fInot\fP correspond to a real key:
+.bP
+.B KEY_RESIZE
+is returned when the \fBSIGWINCH\fP signal has been detected
+(see \fBinitscr\fP(3X) and \fBresizeterm\fR(3X)).
+.bP
+.B KEY_MOUSE
+is returned for mouse-events (see \fBcurs_mouse\fR(3X)).
+.SS Testing key-codes
+.PP
+The \fBhas_key\fR routine takes a key-code value from the above list, and
+returns \fBTRUE\fP or \fBFALSE\fP according to whether