diff --git a/packages/flag-evaluation/src/index.ts b/packages/flag-evaluation/src/index.ts
index 4d57de9e9..a7374a3e7 100644
--- a/packages/flag-evaluation/src/index.ts
+++ b/packages/flag-evaluation/src/index.ts
@@ -131,7 +131,7 @@ export interface ContextFilter {
  * - `type` - Indicates the type of the filter. For this filter type, it will always be "rolloutPercentage".
  * - `key` - A unique key or identifier that distinguishes this rollout filter.
  * - `partialRolloutAttribute` - Specifies the attribute used to evaluate eligibility for the rollout.
- * - `partialRolloutThreshold` - A numeric value representing the upper-bound threshold (0-100) for the percentage-based rollout.
+ * - `partialRolloutThreshold` - A numeric value representing the upper-bound threshold (0-100000) for the percentage-based rollout.
  */
 export type PercentageRolloutFilter = {
   type: "rolloutPercentage";
diff --git a/packages/flag-evaluation/test/index.test.ts b/packages/flag-evaluation/test/index.test.ts
index 4e179d32b..7f34835c7 100644
--- a/packages/flag-evaluation/test/index.test.ts
+++ b/packages/flag-evaluation/test/index.test.ts
@@ -198,6 +198,36 @@ describe("evaluate flag targeting integration ", () => {
     });
   });
 
+  it("evaluates percentage rollouts using user.id", () => {
+    const userRollout = {
+      flagKey: "test-flag",
+      rules: [
+        {
+          value: true,
+          filter: {
+            type: "rolloutPercentage" as const,
+            key: "test-flag",
+            partialRolloutAttribute: "user.id",
+            partialRolloutThreshold: 50000,
+          },
+        },
+      ],
+    };
+
+    expect(
+      evaluateFlagRules({
+        ...userRollout,
+        context: { user: { id: "user-1" } },
+      }).value,
+    ).toBe(true);
+    expect(
+      evaluateFlagRules({
+        ...userRollout,
+        context: { user: { id: "user-2" } },
+      }).value,
+    ).toBeUndefined();
+  });
+
   it("returns list of missing context keys ", async () => {
     const res = evaluateFlagRules({
       ...flag,
diff --git a/packages/node-sdk/test/client.test.ts b/packages/node-sdk/test/client.test.ts
index a0ea0edbe..0f592eba4 100644
--- a/packages/node-sdk/test/client.test.ts
+++ b/packages/node-sdk/test/client.test.ts
@@ -1568,6 +1568,59 @@ describe("ReflagClient", () => {
       });
     });
 
+    it("evaluates percentage rollouts using user.id", async () => {
+      const userRolloutDefinitions: FlagsAPIResponse = {
+        flagStateVersion: 2,
+        features: [
+          {
+            key: "test-flag",
+            description: "User rollout",
+            targeting: {
+              version: 1,
+              rules: [
+                {
+                  filter: {
+                    type: "rolloutPercentage",
+                    key: "test-flag",
+                    partialRolloutAttribute: "user.id",
+                    partialRolloutThreshold: 50000,
+                  },
+                },
+              ],
+            },
+          },
+        ],
+      };
+      httpClient.get.mockResolvedValue({
+        ok: true,
+        status: 200,
+        body: { success: true, ...userRolloutDefinitions },
+      });
+
+      await client.initialize();
+
+      expect(
+        client.getFlag(
+          {
+            user: { id: "user-1" },
+            company,
+            enableTracking: false,
+          },
+          "test-flag",
+        ).isEnabled,
+      ).toBe(true);
+      expect(
+        client.getFlag(
+          {
+            user: { id: "user-2" },
+            company,
+            enableTracking: false,
+          },
+          "test-flag",
+        ).isEnabled,
+      ).toBe(false);
+    });
+
     it("`track` sends all expected events when `enableTracking` is `true`", async () => {
       const context = {
         company,