diff --git a/d3/d3.d.ts b/d3/d3.d.ts
index 236b87d55e..1f5ebe7a1e 100644
--- a/d3/d3.d.ts
+++ b/d3/d3.d.ts
@@ -3032,6 +3032,46 @@ declare module d3 {
             padding(padding: number): Pack<T>;
         }
 
+        export function partition(): Partition<partition.Node>;
+        export function partition<T extends partition.Node>(): Partition<T>;
+
+        module partition {
+            interface Link<T extends Node> {
+                source: T;
+                target: T;
+            }
+
+            interface Node {
+                parent?: Node;
+                children?: number;
+                value?: number;
+                depth?: number;
+                x?: number;
+                y?: number;
+                dx?: number;
+                dy?: number;
+            }
+
+        }
+
+        export interface Partition<T extends partition.Node> {
+            nodes(root: T): T[];
+
+            links(nodes: T[]): partition.Link<T>[];
+
+            children(): (node: T, depth: number) => T[];
+            children(children: (node: T, depth: number) => T[]): Partition<T>;
+
+            sort(): (a: T, b: T) => number;
+            sort(comparator: (a: T, b: T) => number): Partition<T>;
+
+            value(): (node: T) => number;
+            value(value: (node: T) => number): Partition<T>;
+
+            size(): [number, number];
+            size(size: [number, number]): Partition<T>;
+        }
+
         export function pie(): Pie<number>;
         export function pie<T>(): Pie<T>;