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diff --git a/adoc/p_lessthan.adoc b/adoc/p_lessthan.adoc
index ce86406..99a0dff 100644
--- a/adoc/p_lessthan.adoc
+++ b/adoc/p_lessthan.adoc
@@ -1,9 +1,13 @@
+// logic.asm:	WORD p_lessthan, '<',fasm
+
 anchor:p_lessthan[]
 
-Word: <
--------
+=== Word: <
 
-----
-logic.asm:	WORD p_lessthan, '<',fasm
-----
+....
+Data stack: ( v1 v2 -- 0/-1 )
+....
 
+"<" is a function word that replaces a pair of values with -1 if the
+first, v1, is less than the second, v1, otherwise 0. To that end, the
+values are 64-bit signed integers.