diff --git a/libbb/read_key.c b/libbb/read_key.c
index 8d72d2a63..ace23defb 100644
--- a/libbb/read_key.c
+++ b/libbb/read_key.c
@@ -15,7 +15,10 @@ int64_t FAST_FUNC read_key(int fd, char *buffer, int timeout)
 	const char *seq;
 	int n;
 
-	/* Known escape sequences for cursor and function keys */
+	/* Known escape sequences for cursor and function keys.
+	 * See "Xterm Control Sequences"
+	 * http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
+	 */
 	static const char esccmds[] ALIGN1 = {
 		'O','A'        |0x80,KEYCODE_UP      ,
 		'O','B'        |0x80,KEYCODE_DOWN    ,
@@ -44,6 +47,8 @@ int64_t FAST_FUNC read_key(int fd, char *buffer, int timeout)
 		/* ESC [ 1 ; 4 x, where x = A/B/C/D: Alt-Shift-<arrow> */
 		/* ESC [ 1 ; 5 x, where x = A/B/C/D: Ctrl-<arrow> - implemented below */
 		/* ESC [ 1 ; 6 x, where x = A/B/C/D: Ctrl-Shift-<arrow> */
+		/* ESC [ 1 ; 7 x, where x = A/B/C/D: Ctrl-Alt-<arrow> */
+		/* ESC [ 1 ; 8 x, where x = A/B/C/D: Ctrl-Alt-Shift-<arrow> */
 		'[','H'        |0x80,KEYCODE_HOME    , /* xterm */
 		'[','F'        |0x80,KEYCODE_END     , /* xterm */
 		/* [ESC] ESC [ [2] H - [Alt-][Shift-]Home (End similarly?) */
@@ -64,10 +69,10 @@ int64_t FAST_FUNC read_key(int fd, char *buffer, int timeout)
 		'[','7','~'    |0x80,KEYCODE_HOME    , /* vt100? linux vt? or what? */
 		'[','8','~'    |0x80,KEYCODE_END     , /* vt100? linux vt? or what? */
 #if 0
-		'[','1','1','~'|0x80,KEYCODE_FUN1    ,
-		'[','1','2','~'|0x80,KEYCODE_FUN2    ,
-		'[','1','3','~'|0x80,KEYCODE_FUN3    ,
-		'[','1','4','~'|0x80,KEYCODE_FUN4    ,
+		'[','1','1','~'|0x80,KEYCODE_FUN1    , /* old xterm, deprecated by ESC O P */
+		'[','1','2','~'|0x80,KEYCODE_FUN2    , /* old xterm... */
+		'[','1','3','~'|0x80,KEYCODE_FUN3    , /* old xterm... */
+		'[','1','4','~'|0x80,KEYCODE_FUN4    , /* old xterm... */
 		'[','1','5','~'|0x80,KEYCODE_FUN5    ,
 		/* [ESC] ESC [ 1 5 [;2] ~ - [Alt-][Shift-]F5 */
 		'[','1','7','~'|0x80,KEYCODE_FUN6    ,