From 1c13ae337c89850f959588cff270a956717bf041 Mon Sep 17 00:00:00 2001
From: "Brutzman, Don" <brutzman@nps.edu>
Date: Sun, 5 Sep 2021 16:25:31 -0700
Subject: [PATCH] add GRIM reference links

---
 specifications/README.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/specifications/README.md b/specifications/README.md
index 02eb4da1e5..798fe3a900 100644
--- a/specifications/README.md
+++ b/specifications/README.md
@@ -81,3 +81,10 @@ SISO-REF-010 specifies numerical values and associated definitions for fields th
 [Operations Manual (OPMAN)](https://www.sisostds.org/DigitalLibrary.aspx?Command=Core_Download&EntryId=47284)
 
 ---
+
+**6. SISO-STD-001-2015: Standard for Guidance, Rationale, and Interoperability Modalities (GRIM) for the Real-time Platform Reference Federation Object Model (RPR FOM)** <a href="https://www.sisostds.org/ProductsPublications/ReferenceDocuments.aspx" target="_blank"><img src="SisoLogo.jpg" width="314" align="right"/></a>
+* https://www.sisostds.org/ProductsPublications/Standards/SISOStandards.aspx (scroll down near bottom of page)
+SISO-STD-001-2015 encapsulates guidance in the use of the RPR FOM. It provides descriptions of FOM classes and data types and the relationship between Distributed Interactive Simulation (DIS) and the High Level Architecture (HLA)-based RPR FOM, as well as rules for accomplishing specific distributed simulation tasks.
+* Version 2.0 (10 Aug 2015)
+
+---
-- 
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