diff --git a/src/builder.rs b/src/builder.rs
index 1b0140d0..0c1d4544 100644
--- a/src/builder.rs
+++ b/src/builder.rs
@@ -2475,6 +2475,7 @@ pub enum __TypeField {
     EnumValues(Option<Vec<__EnumValueBuilder>>),
     PossibleTypes(Option<Vec<__TypeBuilder>>),
     OfType(Option<__TypeBuilder>),
+    SpecifiedByURL,
     Typename {
         alias: String,
         typename: Option<String>,
@@ -2999,6 +3000,7 @@ impl __Schema {
                             };
                             __TypeField::OfType(unwrapped_type_builder)
                         }
+                        "specifiedByURL" => __TypeField::SpecifiedByURL,
                         introspection::TYPENAME => __TypeField::Typename {
                             alias: alias_or_name(&selection_field),
                             typename: type_.name(),
diff --git a/src/graphql.rs b/src/graphql.rs
index fb7b4339..b3fff41f 100644
--- a/src/graphql.rs
+++ b/src/graphql.rs
@@ -274,6 +274,12 @@ pub trait ___Type {
     fn of_type(&self) -> Option<__Type> {
         None
     }
+
+    // # SCALAR only
+    // specifiedByURL: String
+    fn specified_by_url(&self) -> Option<String> {
+        None
+    }
 }
 
 #[derive(Clone, Debug)]
diff --git a/src/transpile.rs b/src/transpile.rs
index 47c925e1..c2e79b1a 100644
--- a/src/transpile.rs
+++ b/src/transpile.rs
@@ -1900,6 +1900,9 @@ impl Serialize for __TypeBuilder {
                 __TypeField::OfType(t_builder) => {
                     map.serialize_entry(&selection.alias, t_builder)?;
                 }
+                __TypeField::SpecifiedByURL => {
+                    map.serialize_entry(&selection.alias, &self.type_.specified_by_url())?;
+                }
                 __TypeField::Typename { alias, typename } => {
                     map.serialize_entry(&alias, typename)?;
                 }
diff --git a/test/expected/resolve_specified_by_url.out b/test/expected/resolve_specified_by_url.out
new file mode 100644
index 00000000..b9e986d5
--- /dev/null
+++ b/test/expected/resolve_specified_by_url.out
@@ -0,0 +1,30 @@
+begin;
+    comment on schema public is e'@graphql({"inflect_names": true, "introspection": true})';
+    -- specifiedByURL should be queryable and return null for built-in scalars
+    select graphql.resolve(
+        query:='{ __type(name: "Boolean") { specifiedByURL } }'
+    );
+                              resolve
+------------------------------------------------------------------
+ {"data": {"__type": {"specifiedByURL": null}}}
+(1 row)
+
+    -- specifiedByURL should also work alongside other fields
+    select graphql.resolve(
+        query:='{ __type(name: "String") { name kind specifiedByURL } }'
+    );
+                                            resolve
+----------------------------------------------------------------------------------------------
+ {"data": {"__type": {"kind": "SCALAR", "name": "String", "specifiedByURL": null}}}
+(1 row)
+
+    -- specifiedByURL on a non-scalar type (e.g. OBJECT) should also return null
+    select graphql.resolve(
+        query:='{ __type(name: "Query") { name kind specifiedByURL } }'
+    );
+                                           resolve
+---------------------------------------------------------------------------------------------
+ {"data": {"__type": {"kind": "OBJECT", "name": "Query", "specifiedByURL": null}}}
+(1 row)
+
+rollback;
diff --git a/test/sql/resolve_specified_by_url.sql b/test/sql/resolve_specified_by_url.sql
new file mode 100644
index 00000000..5392d2fb
--- /dev/null
+++ b/test/sql/resolve_specified_by_url.sql
@@ -0,0 +1,19 @@
+begin;
+    comment on schema public is e'@graphql({"inflect_names": true, "introspection": true})';
+
+    -- specifiedByURL should be queryable and return null for built-in scalars
+    select graphql.resolve(
+        query:='{ __type(name: "Boolean") { specifiedByURL } }'
+    );
+
+    -- specifiedByURL should also work alongside other fields
+    select graphql.resolve(
+        query:='{ __type(name: "String") { name kind specifiedByURL } }'
+    );
+
+    -- specifiedByURL on a non-scalar type (e.g. OBJECT) should also return null
+    select graphql.resolve(
+        query:='{ __type(name: "Query") { name kind specifiedByURL } }'
+    );
+
+rollback;