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diff --git a/adoc/p_xor.adoc b/adoc/p_xor.adoc
index 04f763a..5c8b637 100644
--- a/adoc/p_xor.adoc
+++ b/adoc/p_xor.adoc
@@ -1,9 +1,13 @@
+// logic.asm:	WORD p_xor, 'XOR',fasm
+
 anchor:p_xor[]
 
-Word: XOR
-----------
+=== Word: XOR
 
-----
-logic.asm:	WORD p_xor, 'XOR',fasm
-----
+....
+Data stack: ( v1 v2 -- v3 )
+....
 
+"XOR" is a function word that replaces a value pair with their bitwise
+exclusion; each bit is 1 if the corresponding bits of the two operands
+differ and 0 if not.