diff --git a/README.md b/README.md
index bc6f3d9b..935dc6ad 100644
--- a/README.md
+++ b/README.md
@@ -15,3 +15,17 @@ sbt
 > project tapeout
 > run-main barstools.tapeout.transforms.GenerateTop -i <myfile>.fir -o <myfile>.v --syn-top <mysyntop> --harness-top <myharnesstop>
 ```
+Building the macro compiler JAR:
+```
+$ sbt
+[...]
+[info] Set current project to root (in build file:/mnt/data/dev/barstools_pcad/)
+> project macros
+[info] Set current project to macros (in build file:/mnt/data/dev/barstools_pcad/)
+> assembly
+[...]
+[info] SHA-1: 77d4c759c825fd0ea93dfec26dbbb649f6cd5c89
+[info] Packaging [...]/macros/target/scala-2.11/macros-assembly-0.1-SNAPSHOT.jar ...
+[info] Done packaging.
+[success] Total time: 28 s, completed Mar 21, 2018 2:28:34 PM
+```