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diff --git a/adoc/p_minus.adoc b/adoc/p_minus.adoc
index 629c926..fddf23a 100644
--- a/adoc/p_minus.adoc
+++ b/adoc/p_minus.adoc
@@ -1,9 +1,13 @@
+// math.asm:	WORD p_minus, '-',fasm
+
 anchor:p_minus[]
 
-Word: -
--------
+=== Word: -
 
-----
-math.asm:	WORD p_minus, '-',fasm
-----
+....
+Data stack: ( v1 v2 -- v3 )
+....
 
+"-" (minus) is a function word that replaces a pair of values with the
+result of reducing the first, v1, with the second, v2. To that end,
+the values are 64-bit signed integers.