diff --git a/UPGRADING.md b/UPGRADING.md
index d97a6ea..1d1b7cb 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -1,5 +1,9 @@
 # Upgrading
 
+## v3.2.0
+
+- Replace any calls to `env.CFile()` builder with `env.Lex()` or `env.Yacc()` as required.
+
 ## v3.0.0
 
 - Move `build` block contents outside of `build` block and remove `build` call.