diff --git a/README.md b/README.md
index 94e6f67f..42d665c7 100644
--- a/README.md
+++ b/README.md
@@ -209,6 +209,10 @@ $ VO_BIT=1 make CONF=linux-x86_64-normal-server-$DEBUG_LEVEL THIRD_PARTY_HEAP=$P
 
 ## Test
 
+We support all the MMTk GC plans in OpenJDK. A full list of MMTk plans can be found [here](https://docs.mmtk.io/api/mmtk/util/options/enum.PlanSelector.html).
+When you run with the OpenJDK build from previous steps, you can choose one of the plans by setting an environment variable `MMTK_PLAN` to one of the plan names.
+In the following examples, we use the generational immix plan, `GenImmix`.
+
 ### Run HelloWorld (without MMTk)
 
 ```console
@@ -219,7 +223,7 @@ class HelloWorld {
     }
 }
 $ ./build/linux-x86_64-normal-server-$DEBUG_LEVEL/jdk/bin/javac HelloWorld.java
-$ ./build/linux-x86_64-normal-server-$DEBUG_LEVEL/jdk/bin/java HelloWorld
+$ MMTK_PLAN=GenImmix ./build/linux-x86_64-normal-server-$DEBUG_LEVEL/jdk/bin/java HelloWorld
 Hello World!
 ```
 
@@ -263,7 +267,7 @@ $ wget https://sourceforge.net/projects/dacapobench/files/9.12-bach-MR1/dacapo-9
 Run a DaCapo benchmark (e.g. `lusearch`):
 
 ```console
-$ ./build/linux-x86_64-normal-server-$DEBUG_LEVEL/jdk/bin/java -XX:+UseThirdPartyHeap -Xms512M -Xmx512M -jar ./dacapo-9.12-MR1-bach.jar lusearch
+$ MMTK_PLAN=GenImmix ./build/linux-x86_64-normal-server-$DEBUG_LEVEL/jdk/bin/java -XX:+UseThirdPartyHeap -Xms512M -Xmx512M -jar ./dacapo-9.12-MR1-bach.jar lusearch
 Using scaled threading model. 24 processors detected, 24 threads used to drive the workload, in a possible range of [1,64]
 ===== DaCapo 9.12-MR1 lusearch starting =====
 4 query batches completed