diff --git a/README.md b/README.md
index 9350bde0..0b43d600 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,8 @@ to operate ITS systems to this day.
 
 See the [`doc` subdirectory](doc) for documentation.
 
+There's a [DDT cheat sheet](doc/DDT.md) for Unix users.
+
 ### Building it from scratch
 
 This repository contains source code, tools, and scripts to build ITS
diff --git a/doc/DDT.md b/doc/DDT.md
new file mode 100644
index 00000000..25310e0d
--- /dev/null
+++ b/doc/DDT.md
@@ -0,0 +1,35 @@
+## DDT cheat sheet for Unix users
+
+To get access to a terminal, first type ^Z (Control-Z).  After that,
+you can log in.
+
+The `$` character represents typing ESC.
+
+| Unix command  | DDT command          | Colon command            |
+| ------------- | -------------------- | ------------------------ |
+| login user    | user$u               | :login user              |
+| logout        | $$u                  | :logout                  |
+| TERM=vt52     |                      | :tctyp vt52              |
+| TERM=vt100    |                      | :crtsty vt100            |
+| ls            | ^F                   | :listf                   |
+| ls dir        | dir^F                | :listf dir               |
+| ls /          | ^R m.f.d. (file)     | :print m.f.d. (file)     |
+| more file     | ^R file              | :print file              |
+| mkdir dir     | ^R dir;..new. (udir) | :print dir;..new. (udir) |
+| cd dir        | dir$$s               | :cwd dir                 |
+| cp f1 f2      | $^R f1,f2            | :copy f1,f2              |
+| rm file       | ^O file              | :delete file             |
+| ln f1 f2      | $^O f1,f2            | :link f1,f2              |
+| mv f1 f2      | $$^O f1,f2           | :rename f1,f2            |
+| mv file dir   |                      | :move file,dir           |
+| emacs         | emacs^K              | :emacs                   |
+| ps            | $$v                  | :listj                   |
+| kill pid      | pid$^X               | :job pid  :kill          |
+| sudo -u u cmd | u$^S cmd             |                          |
+| top           |                      | :peek                    |
+| ^U            | ^D                   |                          |
+| ^C            | ^G                   |                          |
+| ^Z            | ^Z                   |                          |
+| ^D            | ^C                   |                          |
+| fg            | $P                   | :continue                |
+| bg            | ^P                   | :proceed                 |
diff --git a/doc/README.md b/doc/README.md
index 1c8f1851..3a3c4147 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -13,30 +13,3 @@
 - CRTSTY: [manual](info/crtsty.39)
 - TCTYP: [manual](_info_/tctyp.order)
 - DSKDUMP: [commands](sysdoc/dskdmp.order)
-
-### DDT cheat sheet for Unix users
-
-The `$` character represents typing ESC.
-
-| Unix command  | DDT command          | Colon command            |
-| ------------- | -------------------- | ------------------------ |
-| login user   	| user$u               | :login user              |
-| logout       	| $$u                  | :logout                  |
-| TERM=vt52     |                      | :tctyp vt52              |
-| TERM=vt100    |                      | :crtsty vt100            |
-| ls           	| ^F                   | :listf                   |
-| ls dir       	| dir^F                | :listf dir               |
-| ls /         	| ^R m.f.d. (file)     | :print m.f.d. (file)     |
-| more file    	| ^R file              | :print file              |
-| mkdir dir    	| ^R dir;..new. (udir) | :print dir;..new. (udir) |
-| cd dir       	| dir$$s               | :cwd dir                 |
-| cp f1 f2     	| $^R f1,f2            | :copy f1,f2              |
-| rm file      	| ^O file              | :delete file             |
-| ln f1 f2     	| $^O f1,f2            | :link f1,f2              |
-| mv f1 f2     	| $$^O f1,f2           | :rename f1,f2            |
-| mv file dir  	|                      | :move file,dir           |
-| emacs         |                      | :emacs                   |
-| ps           	| $$v                  | :listj                   |
-| killall -9 id	| id$j  $^X            | :job id  :kill           |
-| sudo -u u cmd | u$^S cmd             |                          |
-| top           |                      | :peek                    |