diff --git a/fj/src/lib.rs b/fj/src/lib.rs
index 680d1926c..44f967bbc 100644
--- a/fj/src/lib.rs
+++ b/fj/src/lib.rs
@@ -16,7 +16,7 @@ mod syntax;
 
 pub mod prelude {
     pub use crate::syntax::{
-        Rotate as _, Sketch as _, Sweep as _, Translate as _, Union as _,
+        Group as _, Rotate as _, Sketch as _, Sweep as _, Translate as _,
     };
 }
 
diff --git a/fj/src/syntax.rs b/fj/src/syntax.rs
index 2a206821e..7c809c713 100644
--- a/fj/src/syntax.rs
+++ b/fj/src/syntax.rs
@@ -70,13 +70,13 @@ where
     }
 }
 
-pub trait Union {
+pub trait Group {
     fn group<Other>(&self, other: &Other) -> crate::Group
     where
         Other: Clone + Into<crate::Shape3d>;
 }
 
-impl<T> Union for T
+impl<T> Group for T
 where
     T: Clone + Into<crate::Shape3d>,
 {