diff --git a/README.md b/README.md
index 02ee85d..64167f6 100644
--- a/README.md
+++ b/README.md
@@ -4,28 +4,117 @@
 
 ##Building:
 
-``javac src/com/gc/example/GCExample.java  -d `pwd`; jar cvfm GCExample.jar src/com/gc/example/manifest.txt com/gc/example/GCExample.class;``
+``javac src/com/cds/example/CDSExample.java  -d `pwd`; jar cvfm CDSExample.jar src/com/cds/example/manifest.txt com/cds/example/CDSExample.class;``
 
 
 
-##Running with GC options (JDK 11):
+##Running with CDS options (JDK 8):
 
-``rm -f `pwd`/gc*; java -Xms50m -Xmx50m  -Xlog:gc*=debug:file=`pwd`/gc.log:tags,time:filecount=10,filesize=4M -jar GCExample.jar ``
 
+Generate the archive classes.
 
-##Running with JFR options (JDK 11):
 
-``java -Xms50m -Xmx50m  -XX:+FlightRecorder -XX:StartFlightRecording=disk=true,maxage=2h -jar GCExample.jar ``
+`` sudo java -Xshare:dump -jar CDSExample.jar ``
 
-##Taking the dump:
 
-``jcmd 25270 JFR.dump name=1 filename=`pwd`/gc.jfr``
+Should produce the archive file called classes.jsa at:
 
+`` ls -lh /Library/Java/JavaVirtualMachines/yjava_jdk-8.0_8u242b08.3911256/Contents/Home/jre/lib/server/classes.jsa ``
 
-##Open JFR file with Java Mission Control and analyze.
 
-Running GCViewer to analyze gc logs:
+Use the share file to run:
 
-``java -jar gcviewer-1.36.jar``
+``java  -Xshare:on  -jar CDSExample.jar ``
 
 
+
+##Running with CDS options (JDK 11):
+
+create a list of classes to include in the archive  -XX:DumpLoadedClassList
+
+``java -XX:DumpLoadedClassList=classes.lst -jar CDSExample.jar``
+
+
+Generate the archive classes.
+
+
+`` sudo java -Xshare:dump -jar CDSExample.jar ``
+
+Use the share file to run:
+
+``java  -Xshare:on  -jar CDSExample.jar ``
+
+
+##Running with CDS options (JDK 12):
+
+The JDK comes with one and uses it automatically. If you want to turn that off, launch your application with -Xshare:off.
+
+
+
+##Launch Time Measurements
+
+On:
+
+``time java  -Xshare:on  -jar CDSExample.jar ``
+
+```
+amountblood-lm:java-gc-example charlesk$ time java  -Xshare:on  -jar CDSExample.jar 
+Starting CDSExample...
+args:  []
+Finished CDSExample.
+
+real    0m0.070s
+user    0m0.049s
+sys 0m0.022s
+```
+
+
+Off:
+
+``time java  -Xshare:off  -jar CDSExample.jar ``
+
+```
+amountblood-lm:java-gc-example charlesk$ time java  -Xshare:off  -jar CDSExample.jar 
+Starting CDSExample...
+args:  []
+Finished CDSExample.
+
+real    0m0.088s
+user    0m0.065s
+sys 0m0.025s
+```
+
+
+
+The interesting bit is real, which gives the wall-clock time it took to run the app. 70 ms to 88ms (without class data sharing)
+
+
+
+
+
+## NOTES:
+
+On Java 12+, Java classes are automatically loaded from the archive included in the JDK
+
+On Java 13+, class-data archives can be automatically created by the JVM on shutdown with the command line option -XX:ArchiveClassesAtExit=${ARCHIVE}; to use it, add -XX:SharedArchiveFile=${ARCHIVE} on launch
+
+On Java 10+, it is possible to hand-craft archives in three steps:
+
+create a list of classes to include in the archive
+$ java
+    -XX:DumpLoadedClassList=classes.lst
+    -jar app.jar
+ 
+create the archive
+$ java
+    -Xshare:dump
+    -XX:SharedClassListFile=classes.lst
+    -XX:SharedArchiveFile=app-cds.jsa
+    --class-path app.jar
+ 
+use the archive
+$ java
+    -XX:SharedArchiveFile=app-cds.jsa
+    -jar app.jar
+
+    
\ No newline at end of file
diff --git a/gcviewer-1.36.jar b/gcviewer-1.36.jar
deleted file mode 100644
index 42d611f..0000000
Binary files a/gcviewer-1.36.jar and /dev/null differ
diff --git a/src/com/cds/example/CDSExample.java b/src/com/cds/example/CDSExample.java
new file mode 100644
index 0000000..7bc0a3e
--- /dev/null
+++ b/src/com/cds/example/CDSExample.java
@@ -0,0 +1,18 @@
+package com.cds.example;
+
+import java.util.Arrays;
+
+public class CDSExample {
+
+    public static void main(String[] args) {
+
+        System.out.println("Starting CDSExample...");
+
+        System.out.println("args:  " + Arrays.toString(args));
+
+        System.out.println("Finished CDSExample.");
+        
+    }
+    
+
+}
diff --git a/src/com/cds/example/manifest.txt b/src/com/cds/example/manifest.txt
new file mode 100644
index 0000000..d6c67b3
--- /dev/null
+++ b/src/com/cds/example/manifest.txt
@@ -0,0 +1 @@
+Main-Class: com.cds.example.CDSExample
diff --git a/src/com/gc/example/GCExample.java b/src/com/gc/example/GCExample.java
deleted file mode 100644
index 9f9c843..0000000
--- a/src/com/gc/example/GCExample.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package com.gc.example;
-
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
-
-public class GCExample {
-
-    public static void main(String[] args) {
-
-        System.out.println("Starting GCExample...");
-
-        System.out.println("args:  " + Arrays.toString(args));
-
-        causeOOM();
-
-        while (true) {
-
-            try {
-                
-                System.out.println("Sleeping...");
-                Thread.sleep(5000);
-            } catch (InterruptedException e) {
-                // TODO Auto-generated catch block
-                e.printStackTrace();
-            }
-        }
-        
-    }
-    
-    private static void causeOOM() {
-        
-        List<Object> items = new ArrayList<>(1);
-        try {
-            while (true) {
-                items.add(new Object());
-            }
-        } catch (OutOfMemoryError e) {
-            System.err.println(e);
-        }
-
-    }
-
-}
diff --git a/src/com/gc/example/manifest.txt b/src/com/gc/example/manifest.txt
deleted file mode 100644
index c0e77fb..0000000
--- a/src/com/gc/example/manifest.txt
+++ /dev/null
@@ -1 +0,0 @@
-Main-Class: com.gc.example.GCExample