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diff --git a/adoc/p_within.adoc b/adoc/p_within.adoc
index 3d7ea49..ca23146 100644
--- a/adoc/p_within.adoc
+++ b/adoc/p_within.adoc
@@ -1,9 +1,20 @@
+// logic.asm:	WORD p_within, 'WITHIN',fasm
+
 anchor:p_within[]
 
-Word: WITHIN
-----------
+=== Word: WITHIN
+
+....
+Data stack: ( v lo hi -- 0/-1
+....
 
-----
-logic.asm:	WORD p_within, 'WITHIN',fasm
-----
+"WITHIN" is a function word that replaces a triple of values with -1
+of the the first, v, is within the value range spanned by the second,
+lo, inclusive and third, hi, exclusive.
 
+====
+.Definition concept for WITHIN
+****
+: WITHIN 2 PICK > ROT ROT <= AND ;
+****
+====