diff --git a/README.md b/README.md
index 1a50019..f39c011 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ pub fn main() {
           "radius_squared",
           trick.multiply_float(radius, radius),
         )
-        trick.expression(trick.multiply_float(radius_squared), pi)
+        trick.expression(trick.multiply_float(radius_squared, pi))
       })
     })
     trick.end_module()
diff --git a/TODO.md b/TODO.md
index 699444d..3b58732 100644
--- a/TODO.md
+++ b/TODO.md
@@ -23,3 +23,4 @@ Values marked with `*` are deprioritised and may be delayed until after v1.
 
 - Fix the API for generic types
 - Ensure types are correct if user accidentally shadows a variable
+- Prevent generation of duplicate constructors, functions, constants, and types
diff --git a/src/trick.gleam b/src/trick.gleam
index fc6bf4f..f085531 100644
--- a/src/trick.gleam
+++ b/src/trick.gleam
@@ -15,7 +15,7 @@
 ////       "radius_squared",
 ////       trick.multiply_float(radius, radius),
 ////     )
-////     trick.expression(trick.multiply_float(radius_squared), pi)
+////     trick.expression(trick.multiply_float(radius_squared, pi))
 ////   })
 //// })
 //// trick.end_module()