Update documentation

Change-Id: Ic608d16733581ae5afb8094c4794061b94149f99

src/main/resources/Documentation/about.md

diff --git a/src/main/resources/Documentation/about.md b/src/main/resources/Documentation/about.md
index 76d21dd..27679cf 100644
--- a/src/main/resources/Documentation/about.md
+++ b/src/main/resources/Documentation/about.md
@@ -25,15 +25,26 @@
 used to provide system-level version metadata.  One can also use "git bisect" on
 the branches to identify system-level regression.
 
+The subject line of the change that triggered the snapshot manifest is included
+in the commit message of the snapshot manifest.  This way, you can get a summary
+sequence of changes of all repository described by that manifest by running the
+following git log command in the snapshot manifest branch:
+
+```
+git log --pretty=format:%b
+```
+
 * Enabled by project.config in the manifest project to be monitored
 * Manifest class is generated from 'repo help manifest' DTD using JAXB
+(part of the build step)
 * \<include\>s are expanded similar to "repo manifest -o" (only works for
 manifests in the same source manifest repository reference by relative path)
 * Supports \<remove-project\>
-* Circular update loop is prevented by not monitoring any of the rev-specific
+* Circular update loop is prevented by not monitoring any of the snapshot
 manifest repositories
 * Projects in the manifests are assumed to be on the server.  (There is no check
 currently so it's a potential source of error.)
+* Snapshot manifests are generated when the source manifests are updated
 
 
 ```
@@ -49,19 +60,15 @@
 * TODO: strict mode, only monitor projects using default (no remote)
 * TODO: split mode (store all manifests in same branch structure as source instead of flattening the underlying file strcuture)
 * TODO: not monitor non-local projects
+* TODO: provide hook for non-local projects to trigger snapshot update
 
-* TODO: make sure no circular dependencies (project with manifest subscription is not in the
-manifest being monitored.)
-* TODO: support changes in manifest
-
-* resolve relative path in include
-* supports include tag in manifest
+* TODO: add something to prevent loop even if store repo is the same as source
+manifest repo
 
 * TODO: check project.config on newly created project
 
 * TODO: include an external manifest DTD or XML schema/XSD
-* generates/xjc classes from DTD/XSD at build time
-* TODO add test verify include manifest have original project
+* TODO add test verify manifest that can cause circular conditions
 * TODO sub dir include manifest have same level include working