diff --git a/src/api/types/DocumentsCreateRequest.ts b/src/api/types/DocumentsCreateRequest.ts
index 57ce95be..e61c566b 100644
--- a/src/api/types/DocumentsCreateRequest.ts
+++ b/src/api/types/DocumentsCreateRequest.ts
@@ -9,5 +9,5 @@ export type DocumentsCreateRequest =
      * Standard method for document generation: Use template key to generate document based on pre-defined template. */
     | Corti.DocumentsCreateRequestWithTemplateKey
     /**
-     * Advanced method for document generation: Define sectionKeys in the request to build a template dynamically. See a detailed example [here](/templates/documents-advanced#assemble-a-template-with-extra-instructions). */
+     * Advanced method for document generation: Define Sections in the request to build a template dynamically. See a detailed example [here](/templates/documents-advanced#assemble-a-template-with-extra-instructions). */
     | Corti.DocumentsCreateRequestWithTemplate;
diff --git a/src/api/types/DocumentsSectionOverride.ts b/src/api/types/DocumentsSectionOverride.ts
new file mode 100644
index 00000000..85736e5f
--- /dev/null
+++ b/src/api/types/DocumentsSectionOverride.ts
@@ -0,0 +1,16 @@
+/**
+ * This file was auto-generated by Fern from our API Definition.
+ */
+
+export interface DocumentsSectionOverride {
+    /** The key of the section to be used during document generation. */
+    key: string;
+    /** Override to use as the name for the section during document generation. */
+    nameOverride?: string;
+    /** Override to use for the section-level writing style. */
+    writingStyleOverride?: string;
+    /** Override to use for the section-level format rule. */
+    formatRuleOverride?: string;
+    /** Override to use for the section-level additional instructions. */
+    additionalInstructionsOverride?: string;
+}
diff --git a/src/api/types/DocumentsTemplate.ts b/src/api/types/DocumentsTemplate.ts
index 9531b8be..af732607 100644
--- a/src/api/types/DocumentsTemplate.ts
+++ b/src/api/types/DocumentsTemplate.ts
@@ -4,4 +4,10 @@
 
 import * as Corti from "../index.js";
 
-export type DocumentsTemplate = Corti.DocumentsTemplateWithSectionKeys;
+export type DocumentsTemplate =
+    /**
+     * Flexible sections to be used in document generation. */
+    | Corti.DocumentsTemplateWithSections
+    /**
+     * Section keys to be used in document generation, without overrides. */
+    | Corti.DocumentsTemplateWithSectionKeys;
diff --git a/src/api/types/DocumentsTemplateWithSections.ts b/src/api/types/DocumentsTemplateWithSections.ts
new file mode 100644
index 00000000..33a7505c
--- /dev/null
+++ b/src/api/types/DocumentsTemplateWithSections.ts
@@ -0,0 +1,13 @@
+/**
+ * This file was auto-generated by Fern from our API Definition.
+ */
+
+import * as Corti from "../index.js";
+
+export interface DocumentsTemplateWithSections {
+    sections?: Corti.DocumentsSectionOverride[];
+    /** A brief description of the document that can help give the LLM some context. */
+    description?: string;
+    /** Override to use for the template-level additional instructions. */
+    additionalInstructionsOverride?: string;
+}
diff --git a/src/api/types/index.ts b/src/api/types/index.ts
index a8ae8f54..6899c8d7 100644
--- a/src/api/types/index.ts
+++ b/src/api/types/index.ts
@@ -3,8 +3,10 @@ export * from "./DocumentsContextWithFacts.js";
 export * from "./DocumentsContextWithTranscript.js";
 export * from "./DocumentsContextWithString.js";
 export * from "./DocumentsSection.js";
+export * from "./DocumentsSectionOverride.js";
 export * from "./DocumentsTemplate.js";
 export * from "./DocumentsTemplateWithSectionKeys.js";
+export * from "./DocumentsTemplateWithSections.js";
 export * from "./InteractionsEncounterCreateRequest.js";
 export * from "./InteractionsEncounterUpdateRequest.js";
 export * from "./InteractionsEncounterResponse.js";
diff --git a/src/serialization/types/DocumentsSectionOverride.ts b/src/serialization/types/DocumentsSectionOverride.ts
new file mode 100644
index 00000000..46d1a7f3
--- /dev/null
+++ b/src/serialization/types/DocumentsSectionOverride.ts
@@ -0,0 +1,28 @@
+/**
+ * This file was auto-generated by Fern from our API Definition.
+ */
+
+import * as serializers from "../index.js";
+import * as Corti from "../../api/index.js";
+import * as core from "../../core/index.js";
+
+export const DocumentsSectionOverride: core.serialization.ObjectSchema<
+    serializers.DocumentsSectionOverride.Raw,
+    Corti.DocumentsSectionOverride
+> = core.serialization.object({
+    key: core.serialization.string(),
+    nameOverride: core.serialization.string().optional(),
+    writingStyleOverride: core.serialization.string().optional(),
+    formatRuleOverride: core.serialization.string().optional(),
+    additionalInstructionsOverride: core.serialization.string().optional(),
+});
+
+export declare namespace DocumentsSectionOverride {
+    export interface Raw {
+        key: string;
+        nameOverride?: string | null;
+        writingStyleOverride?: string | null;
+        formatRuleOverride?: string | null;
+        additionalInstructionsOverride?: string | null;
+    }
+}
diff --git a/src/serialization/types/DocumentsTemplate.ts b/src/serialization/types/DocumentsTemplate.ts
index ec097bcc..ebd6c6ab 100644
--- a/src/serialization/types/DocumentsTemplate.ts
+++ b/src/serialization/types/DocumentsTemplate.ts
@@ -5,13 +5,12 @@
 import * as serializers from "../index.js";
 import * as Corti from "../../api/index.js";
 import * as core from "../../core/index.js";
+import { DocumentsTemplateWithSections } from "./DocumentsTemplateWithSections.js";
 import { DocumentsTemplateWithSectionKeys } from "./DocumentsTemplateWithSectionKeys.js";
 
-export const DocumentsTemplate: core.serialization.ObjectSchema<
-    serializers.DocumentsTemplate.Raw,
-    Corti.DocumentsTemplate
-> = DocumentsTemplateWithSectionKeys;
+export const DocumentsTemplate: core.serialization.Schema<serializers.DocumentsTemplate.Raw, Corti.DocumentsTemplate> =
+    core.serialization.undiscriminatedUnion([DocumentsTemplateWithSections, DocumentsTemplateWithSectionKeys]);
 
 export declare namespace DocumentsTemplate {
-    export type Raw = DocumentsTemplateWithSectionKeys.Raw;
+    export type Raw = DocumentsTemplateWithSections.Raw | DocumentsTemplateWithSectionKeys.Raw;
 }
diff --git a/src/serialization/types/DocumentsTemplateWithSections.ts b/src/serialization/types/DocumentsTemplateWithSections.ts
new file mode 100644
index 00000000..1cf2393d
--- /dev/null
+++ b/src/serialization/types/DocumentsTemplateWithSections.ts
@@ -0,0 +1,25 @@
+/**
+ * This file was auto-generated by Fern from our API Definition.
+ */
+
+import * as serializers from "../index.js";
+import * as Corti from "../../api/index.js";
+import * as core from "../../core/index.js";
+import { DocumentsSectionOverride } from "./DocumentsSectionOverride.js";
+
+export const DocumentsTemplateWithSections: core.serialization.ObjectSchema<
+    serializers.DocumentsTemplateWithSections.Raw,
+    Corti.DocumentsTemplateWithSections
+> = core.serialization.object({
+    sections: core.serialization.list(DocumentsSectionOverride).optional(),
+    description: core.serialization.string().optional(),
+    additionalInstructionsOverride: core.serialization.string().optional(),
+});
+
+export declare namespace DocumentsTemplateWithSections {
+    export interface Raw {
+        sections?: DocumentsSectionOverride.Raw[] | null;
+        description?: string | null;
+        additionalInstructionsOverride?: string | null;
+    }
+}
diff --git a/src/serialization/types/index.ts b/src/serialization/types/index.ts
index a8ae8f54..6899c8d7 100644
--- a/src/serialization/types/index.ts
+++ b/src/serialization/types/index.ts
@@ -3,8 +3,10 @@ export * from "./DocumentsContextWithFacts.js";
 export * from "./DocumentsContextWithTranscript.js";
 export * from "./DocumentsContextWithString.js";
 export * from "./DocumentsSection.js";
+export * from "./DocumentsSectionOverride.js";
 export * from "./DocumentsTemplate.js";
 export * from "./DocumentsTemplateWithSectionKeys.js";
+export * from "./DocumentsTemplateWithSections.js";
 export * from "./InteractionsEncounterCreateRequest.js";
 export * from "./InteractionsEncounterUpdateRequest.js";
 export * from "./InteractionsEncounterResponse.js";
diff --git a/yarn.lock b/yarn.lock
index ba965023..27a8da6d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1300,9 +1300,9 @@ decimal.js@^10.4.2:
   integrity sha512-YpgQiITW3JXGntzdUmyUR1V812Hn8T1YVXhCu+wO3OpS4eU9l4YdD3qjyiKdV6mvV29zapkMeD390UVEf2lkUg==
 
 dedent@^1.0.0:
-  version "1.7.0"
-  resolved "https://registry.yarnpkg.com/dedent/-/dedent-1.7.0.tgz#c1f9445335f0175a96587be245a282ff451446ca"
-  integrity sha512-HGFtf8yhuhGhqO07SV79tRp+br4MnbdjeVxotpn1QBl30pcLLCQjX5b2295ll0fv8RKDKsmWYrl05usHM9CewQ==
+  version "1.7.1"
+  resolved "https://registry.yarnpkg.com/dedent/-/dedent-1.7.1.tgz#364661eea3d73f3faba7089214420ec2f8f13e15"
+  integrity sha512-9JmrhGZpOlEgOLdQgSm0zxFaYoQon408V1v49aqTWuXENVlnCuY9JBZcXZiCsZQWDjTm5Qf/nIvAy77mXDAjEg==
 
 deepmerge@^4.2.2:
   version "4.3.1"