diff --git a/README.md b/README.md
index eb0fa0dc..f054109c 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,8 @@ stockfish to run under the Cartesi machine emulator.
 
 # Setup Cartesi SDK
 Build using Cartesi GCC. I just copied them from the docker build
-and put them in my path (outside of the docker).
+and put them in my path (outside of the docker). It's probably
+easiest to build in the SDK docker.
 
 ```
 git clone --recursive https://github.com/cartesi/machine-emulator-sdk
@@ -38,18 +39,16 @@ cd ..
 cp -p src/stockfish cartesi/img/stockfish
 
 # Make 64 megabyte ext2 disk image with stockfish and shell script
-genext2fs -b 65536 -d cartesi/img cartesi/stockfish.ext2
+genext2fs -b 51200 -d cartesi/img cartesi/stockfish.ext2
 ```
 
 # Run Stockfish in Emulator
 To run the disk images, using upstream rootfs:
 
 ```
-# XXX too much memory, but default 64 megs isn't enough.
-# Lower it & test.
 
 cartesi-machine								\
-	--ram-length=512Mi						\
+	--ram-length=256Mi						\
 	--flash-drive=label:stockfish,filename:cartesi/stockfish.ext2	\
 	--flash-drive=label:root,filename:/opt/cartesi/share/images/rootfs.ext2	\
 	-- /mnt/stockfish/stockfish.sh
@@ -57,7 +56,7 @@ cartesi-machine								\
 ```
 
 # Emulator Output
-This takes "awhile" to run:
+This takes ~3 minutes to run:
 
 ```
          .
@@ -106,6 +105,8 @@ Cycles: 3142947347
 
 * Make image of RAM with stockfish already run once and loaded.
 
+* Fix tests.
+
 # Upstream
 See: