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diff --git a/adoc/p_2dup.adoc b/adoc/p_2dup.adoc
index 17c0005..d425131 100644
--- a/adoc/p_2dup.adoc
+++ b/adoc/p_2dup.adoc
@@ -1,9 +1,19 @@
+// stack.asm:	WORD p_2dup, '2DUP',fasm
+
 anchor:p_2dup[]
 
-Word: 2DUP
-----------
+=== Word: 2DUP
+
+....
+Data stack: ( v1 v2 -- v1 v2 v1 v2 )
+....
 
-----
-stack.asm:	WORD p_2dup, '2DUP',fasm
-----
+"2DUP" is a function word that duplicates the top 2 cells on the data
+stack.
 
+====
+.Definition concept for 2DUP
+****
+( v1 v2 -- v1 v2 v1 v2 ) : 2DUP OVER OVER ;
+****
+====