diff --git a/README.org b/README.org
index 4e35463..5197f4c 100644
--- a/README.org
+++ b/README.org
@@ -3,3 +3,9 @@
 #+BEGIN_SRC bash
 bear -- make
 #+END_SRC
+
+** branches
+*** Part 1
+Part 1 of this lab is the the 750 millisecond pulse version, available in the [[https://git.therats.win/jazz/elab2/src/branch/][750ms]] branch.
+*** Part 2
+Part 2 is the the 50 microsecond pulse version, available in the [[https://git.therats.win/jazz/elab2/src/branch/50us/][50us]] branch.