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diff --git a/adoc/p_0equal.adoc b/adoc/p_0equal.adoc
index 63980d4..827c0f1 100644
--- a/adoc/p_0equal.adoc
+++ b/adoc/p_0equal.adoc
@@ -1,9 +1,16 @@
+// logic.asm:	WORD p_0equal, '0=',fasm
+
 anchor:p_0equal[]
 
-Word: 0=
-----------
+=== Word: 0=
+
+....
+Data stack: ( v -- 0/-1 )
+....
+
 
-----
-logic.asm:	WORD p_0equal, '0=',fasm
-----
+"0=" is a function word that replaces a value with its logical
+complement; the result is zero if the value non-zero, and the result
+is non-zero if the value is zero.
 
+Compare with <<p_not,NOT>>.