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-rw-r--r--tvix/eval/src/builtins/mod.rs3
1 files changed, 3 insertions, 0 deletions
diff --git a/tvix/eval/src/builtins/mod.rs b/tvix/eval/src/builtins/mod.rs
index 1fe5d4a83eb1..f08c17904584 100644
--- a/tvix/eval/src/builtins/mod.rs
+++ b/tvix/eval/src/builtins/mod.rs
@@ -36,6 +36,9 @@ macro_rules! force {
     };
 }
 
+/// Return all pure builtins, that is all builtins that do not rely on
+/// I/O outside of the VM and which can be used in any contexts (e.g.
+/// WASM).
 fn pure_builtins() -> Vec<Builtin> {
     vec![
         Builtin::new("add", 2, |mut args, _| {