diff --git a/src/at/internal/decoding.gleam b/src/at/internal/decoding.gleam
new file mode 100644
index 0000000..dd9d5ea
--- /dev/null
+++ b/src/at/internal/decoding.gleam
@@ -0,0 +1,14 @@
+// IMPORTS ---------------------------------------------------------------------
+
+import gleam/dynamic/decode.{type Decoder}
+import gleam/option.{type Option, None, Some}
+
+///
+/// 
+pub fn optional_field(
+  name: String,
+  decoder: Decoder(a),
+  next: fn(Option(a)) -> Decoder(b),
+) -> Decoder(b) {
+  decode.optional_field(name, None, decode.map(decoder, Some), next)
+}