From cf164b2746d641b82c0e6e87945badeddce37528 Mon Sep 17 00:00:00 2001
From: Phil Budne <phil@ultimate.com>
Date: Mon, 7 Mar 2016 00:16:29 -0500
Subject: [PATCH] add comment from v1 as man page

---
 tools/as7 | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/as7 b/tools/as7
index dcc3d81..a64abef 100755
--- a/tools/as7
+++ b/tools/as7
@@ -53,6 +53,13 @@ GetOptions(
 
 usage() if ( @ARGV < 1 );
 
+# http://minnie.tuhs.org/cgi-bin/utree.pl?file=V3/man/manx/as.1
+# ".." is the relocation constant and is added to each relocatable
+#    reference.  On a PDP-11 with relocation hardware, its value is 0; on
+#    most systems without protection, its value is 40000(8).
+
+# PLB: "relocatable" values are flagged with $RELATIVE
+
 # start with the location counter at zero
 # predefine syscall and opcodes as variables
 %Var = (