diff --git a/Makefile b/Makefile
index 58f1651a..1c63b29d 100644
--- a/Makefile
+++ b/Makefile
@@ -35,7 +35,7 @@ DOC = info _info_ sysdoc sysnet syshst kshack _teco_ emacs emacs1 c kcc \
       kldcp libdoc lisp _mail_ midas quux scheme manual wp chess ms macdoc \
       aplogo _temp_ pdp11 chsncp cbf rug bawden llogo eak clib teach pcnet \
       combat pdl minits mits_s chaos hal -pics- imlac maint cent ksc klh \
-      digest prs
+      digest prs decus
 BIN = sys sys1 sys2 emacs _teco_ lisp liblsp alan inquir sail comlap \
       c decsys graphs draw datdrw fonts fonts1 fonts2 games macsym \
       maint imlac _www_ gt40 llogo bawden sysbin -pics- lmman r shrdlu \
diff --git a/doc/decus/-read-.-this- b/doc/decus/-read-.-this-
new file mode 100644
index 00000000..5e3cd004
--- /dev/null
+++ b/doc/decus/-read-.-this-
@@ -0,0 +1 @@
+This directory has files copied from DECUS tapes.