diff --git a/rc.d/winsize b/rc.d/winsize
new file mode 100644
index 0000000..0152ea4
--- /dev/null
+++ b/rc.d/winsize
@@ -0,0 +1,3 @@
+# check the window size after each command and, if necessary,
+# update the values of LINES and COLUMNS.
+shopt -s checkwinsize