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diff --git a/adoc/p_swap.adoc b/adoc/p_swap.adoc
index 981bde7..f2e27c7 100644
--- a/adoc/p_swap.adoc
+++ b/adoc/p_swap.adoc
@@ -1,9 +1,11 @@
+// stack.asm:	WORD p_swap, 'SWAP',fasm
+
 anchor:p_swap[]
 
-Word: SWAP
-----------
+=== Word: SWAP
 
-----
-stack.asm:	WORD p_swap, 'SWAP',fasm
-----
+....
+Data stack: ( v1 v2 -- v2 v1 )
+....
 
+"SWAP" is a function word the swaps the top two data stack cells.