-The shortcuts ^A, ^E, ^U, and ^K do somehow what they do in readline,
-and you can cancel the selection by either interrupting the command
-with ^C or by typing ^G.
+Keys corresponding to ASCII codes between " " and "~" add a character
+to the pattern string. The Backspace key, "^H" and "^?" delete the
+character immediately on the left of the cursor, while the Delete key
+and "^D" delete the character at cursor location.
+
+The Left and Right cursor keys move the editing cursor
+accordingly. The Up and Down cursor keys move the selected line one
+entry at a time, and PageUp and PageDown move it by ten entries. The
+Home and End key move to the top and the bottom of the list
+respectively. The return key selects the current line and exits.
+
+The keys "^A", "^E", "^U", and "^K" do somehow what they do in
+readline, and you can exit selector without doing anything by either
+interrupting the command with "^C" or by typing "^G" or the Escape
+key.
+
+The key "^R" switches between the multi-substring and the regexp
+selection mode, and "^I" between the case-sensitive and
+case-insensitive modes.