diff --git a/september.plan b/september.plan
index 2f55aa35bc..e7bc583e50 100644
--- a/september.plan
+++ b/september.plan
@@ -29,4 +29,5 @@
 - remove all compiler memory leaks
 - optimize the parser (reduce map lookups)
 - prebuilt binaries for all platforms
+- cache vlib (right now it's re-compiled every time)