Add a key string for space ("Space") and document the names, suggested by

guenther@. Also document how to bind " and ', suggested by miod@.

key-string.c

@@ -57,6 +57,7 @@ struct {
 	{ "PPage",	KEYC_PPAGE },
 	{ "Tab",	'\011' },
 	{ "BTab",	KEYC_BTAB },
+	{ "Space",	' ' },
 	{ "BSpace",	KEYC_BSPACE },
 	{ "Enter",	'\r' },
 	{ "Escape",	'\033' },

tmux.1

@@ -978,6 +978,50 @@ destroyed.
 Move up a pane.
 .El
 .Sh KEY BINDINGS
+.Nm
+allows a command to be bound to most keys, with or without a prefix key.
+When specifying keys, most represent themselves (for example
+.Ql A
+to
+.Ql Z
+).
+Ctrl keys may be prefixed with
+.Ql C-
+or
+.Ql ^
+, and Alt (meta) with
+.Ql M- .
+In addition, the following special key names are accepted:
+.Em BSpace ,
+.Em BTab ,
+.Em DC
+(Delete),
+.Em End ,
+.Em Enter ,
+.Em Escape ,
+.Em F1
+to
+.Em F20 ,
+.Em Home ,
+.Em IC
+(Insert),
+.Em NPage
+(Page Up),
+.Em PPage
+(Page Down),
+.Em Space ,
+and
+.Em Tab .
+Note that to bind the
+.Ql \&"
+or
+.Ql '
+keys, quotation marks are necessary, for example:
+.Bd -literal -offset indent
+bind-key '"' split-window
+bind-key "'" select-prompt
+.Ed
+.Pp
 Commands related to key bindings are as follows:
 .Bl -tag -width Ds
 .It Xo Ic bind-key
@@ -990,14 +1034,6 @@ Bind key
 .Ar key
 to
 .Ar command .
-Keys may be specified prefixed with
-.Ql C-
-or
-.Ql ^
-for Ctrl keys, or
-.Ql M-
-for Alt (meta) keys.
-.Pp
 By default (without
 .Fl t )
 the primary key bindings are modified (those normally activated with the prefix