diff --git a/Cargo.toml b/Cargo.toml
index 34f842e..0be6348 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "num-prime"
-version = "0.3.3"
+version = "0.4.0"
 edition = "2018"
 
 repository = "https://github.com/cmpute/num-prime"
@@ -32,6 +32,7 @@ features = ["rand"]
 [features]
 default = ['big-table', 'big-int']
 big-table = []
+# TODO: use the new cargo feature to override the num-bigint option
 big-int = ['num-bigint', 'num-modular/num-bigint']
 
 [workspace]