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diff --git a/adoc/p_negate.adoc b/adoc/p_negate.adoc
index b47e603..6c65a15 100644
--- a/adoc/p_negate.adoc
+++ b/adoc/p_negate.adoc
@@ -1,9 +1,13 @@
+// math.asm:	WORD p_negate, 'NEGATE',fasm
+
 anchor:p_negate[]
 
-Word: NEGATE
-----------
+=== Word: NEGATE
 
-----
-math.asm:	WORD p_negate, 'NEGATE',fasm
-----
+....
+Data stack: ( v1 -- v2 )
+....
 
+"NEGATE" is a function word that replaces a value with its
+2's-complement negation. To that end, the values are 64-bit signed
+integers.