diff --git a/INSTALL.md b/INSTALL.md
index 8d0dd71c49..e9210183c6 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -51,6 +51,7 @@ This requires that you have installed [stack][stack] (which we strongly recommen
 
     cabal sandbox init
     cabal sandbox add-source ./liquid-fixpoint
+    cabal sandbox add-source ./liquiddesugar
     cabal install
 
 ## Troubleshooting