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diff --git a/adoc/p_2dup.adoc b/adoc/p_2dup.adoc
index 17c0005..0b39b08 100644
--- a/adoc/p_2dup.adoc
+++ b/adoc/p_2dup.adoc
@@ -1,9 +1,20 @@
+// stack.asm:	WORD p_2dup, '2DUP',fasm
+
 anchor:p_2dup[]
 
-Word: 2DUP
-----------
+=== Word: 2DUP
+
+....
+Data stack: ( v1 v2 -- v1 v2 v1 v2 )
+....
 
+"2DUP" is a function word that duplicates the top 2 cells on the data
+stack.
+
+====
+.Word: 2DUP
+[caption='Definition concept {counter:exec}: ']
 ----
-stack.asm:	WORD p_2dup, '2DUP',fasm
+: 2DUP OVER OVER ;
 ----
-
+====