From 7d118ae9b154cf06564fe08504231824b7da2721 Mon Sep 17 00:00:00 2001
From: Fanny Rodolakis <rodolakis@anl.gov>
Date: Mon, 24 Apr 2023 14:56:33 -0500
Subject: [PATCH] 2.5 explanation

---
 2-IOC-deployment.md | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/2-IOC-deployment.md b/2-IOC-deployment.md
index ad1d68f..9d3a4af 100644
--- a/2-IOC-deployment.md
+++ b/2-IOC-deployment.md
@@ -164,6 +164,18 @@ $
 ```
 </details>
 
+<details>
+<summary>what does this mean?</summary>
+
+We are using a synApps release of EPICS, which is a set of pre-built support modules for EPICS. The ``SUPPORT`` variable is defined to point to the directory where the synApps support modules are installed: 
+**/APSshare/epics/synApps_6_2_1/support**.
+
+The ``-include`` directive is used to include the **configure/RELEASE** file from the synApps support module directory, which sets various EPICS-related environment variables, including ``EPICS_BASE``, as needed for building the IOC.
+
+Therefore, we do not need to explicitly set the ``EPICS_BASE`` variable in your **configure/RELEASE** file because it is already set in the synApps support module's **configure/RELEASE** file.
+
+</details>
+
 ### 2.6 Build the IOC (attempt #2)
 
 If following the build succeeds, skip to step 2.9
-- 
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