--- a/README.md
+++ b/README.md
@@ -391,10 +391,10 @@ to set `true`; it's effectively a shortcut for `foo=true`).
 - `cascade` -- small optimization for sequences, transform `x, x` into `x`
   and `x = something(), x` into `x = something()`
 
-- `collapse_vars` -- default `false`. Collapse single-use `var` and `const`
+- `collapse_vars` -- Collapse single-use `var` and `const`
   definitions when possible.
 
-- `reduce_vars` -- default `false`. Improve optimization on variables assigned
+- `reduce_vars` -- Improve optimization on variables assigned
   with and used as constant values.
 
 - `warnings` -- display warnings when dropping unreachable code or unused