diff --git a/README.md b/README.md
index 775062d..b085209 100644
--- a/README.md
+++ b/README.md
@@ -59,12 +59,6 @@ The OS versions are:
 
 For all operating systems we generate images for
 
-- centos7.json will build:
-  - VirtualBox (user: packer/changeme1234)
-
-- aws-centos7-base.json will build:
-  - AMI for AWS (user: centos/centos)
-
 - sibboleth-appliance.json will build:
   - VirtualBox (user: centos/centos)
 
@@ -72,12 +66,8 @@ This template only is tested against 64 bit systems. With the following sizing r
 ```
   "profile": "xfs",
   "disk_size": "20000",
-  "memory": "6122",
-  "cpus": "2",
-```
-
-```
-  "disk_size": 81920
+  "memory": "2048",
+  "cpus": "1",
 ```
 
 ## Post Processors
@@ -88,9 +78,19 @@ The final VM appliance formats will be uploaded into AWS infrastructure. The two
 - Compressed Vagrant format
 - Imported AWS AMI
 
+## Updating CentOS release
+
+When CentOS distributes a new Minimal ISO build to mirrors, the ISO checksum will fail.
+
+To update the repo, download the file in question, and perform this command on it:
+
+`shasum -a 256 CentOS-7-x86_64-Minimal-1611.iso`
+
+You can then update the JSON config with the output.
+
 
 # License
 
-TBD
+Apache2
 
 
diff --git a/shibboleth-appliance.json b/shibboleth-appliance.json
index 11ca4f6..22c2d8c 100644
--- a/shibboleth-appliance.json
+++ b/shibboleth-appliance.json
@@ -44,7 +44,7 @@
             ["modifyvm", "{{.Name}}", "--ostype", "{{user `guest_os_type`}}"]
         ],
         "iso_url": "http://mirrors.mit.edu/centos/7/isos/x86_64/CentOS-7-x86_64-Minimal-1611.iso",
-        "iso_checksum": "89e9b4587e2f9e942e857034bb9aee0085e07d094a94057f8f16c7841f218db2",
+        "iso_checksum": "27bd866242ee058b7a5754e83d8ee8403e216b93d130d800852a96f41c34d86a",
         "iso_checksum_type": "sha256",
         "http_directory": "http",
         "boot_command": ["<tab> text ks=http://{{.HTTPIP}}:{{.HTTPPort}}/ks-{{user `profile`}}.cfg<enter><wait>"],