1 files changed, 2 insertions, 0 deletions
diff --git a/src/eval/func.rs b/src/eval/func.rs
index 75231fc9..a224c5b8 100644
--- a/src/eval/func.rs
+++ b/src/eval/func.rs
@@ -279,6 +279,8 @@ pub struct ParamInfo {
     pub docs: &'static str,
     /// Valid values for the parameter.
     pub cast: CastInfo,
+    /// Creates an instance of the parameter's default value.
+    pub default: Option<fn() -> Value>,
     /// Is the parameter positional?
     pub positional: bool,
     /// Is the parameter named?