diff --git a/README.md b/README.md
index ca2d057..fc8b00c 100644
--- a/README.md
+++ b/README.md
@@ -63,6 +63,11 @@ const firestore = new FirestoreAdminClient();
 `firestore-admin` will take care of parsing the data to/from JSON when
 fetching/updating documents.
 
+If you work with Firestore Timestamp fields, read the
+[Using timestamps](#using-timestamps) section.<br /> If you need to query
+documents by their ID, read the [Using document IDs in a filter](#using-document-ids-in-a-filter)
+section.
+
 ### Create a document
 
 ```typescript
@@ -204,7 +209,8 @@ await firestore.createDocument("my-collection", {
 });
 ```
 
-The above will be converted to a Firestore timestamp automatically.
+The above `Date` object will be converted to a Firestore timestamp
+automatically.
 
 When filtering results by timestamp, make sure to use `Date` objects as well,
 e.g.:
@@ -220,3 +226,33 @@ const documents = await firestore.getDocumentsInCollection("my-collection", {
   },
 });
 ```
+
+In the query results, timestamp fields will be returned as an ISO Date string,
+e.g. `2025-01-01T00:00:00.000Z`.
+
+## Using document IDs in a filter
+
+If you need to filter query results by document IDs in the
+`getDocumentsInCollection` method, you can do so with the `documentId` field.
+
+For example:
+
+```typescript
+// Will return all documents in the collection with the document IDs `docId1` and `docId2`.
+const documents = await firestore.getDocumentsInCollection("my-collection", {
+  where: {
+    filters: [["documentId", FirestoreOperator.IN, ["docId1", "docId2"]]],
+  },
+});
+
+// You can still combine it with other filters, e.g.:
+
+const documents = await firestore.getDocumentsInCollection("my-collection", {
+  where: {
+    filters: [
+      ["documentId", FirestoreOperator.IN, ["docId1", "docId2"]],
+      ["isActive", FirestoreOperator.EQUAL, true],
+    ],
+  },
+});
+```
diff --git a/deno.json b/deno.json
index 0cb3081..30e17d2 100644
--- a/deno.json
+++ b/deno.json
@@ -1,6 +1,6 @@
 {
   "name": "@koiztech/firestore-admin",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "exports": "./mod.ts",
   "tasks": {
     "dev": "deno run --watch --env mod.ts",
diff --git a/mod.ts b/mod.ts
index a5e40e9..34a054f 100644
--- a/mod.ts
+++ b/mod.ts
@@ -231,13 +231,40 @@ export class FirestoreAdminClient {
         structuredQuery.where = {
           compositeFilter: {
             op: "AND",
-            filters: options.where.filters.map(([field, op, value]) => ({
-              fieldFilter: {
-                field: { fieldPath: field },
-                op,
-                value: this.encodeValue(value),
-              },
-            })),
+            filters: options.where.filters.map(([field, op, value]) => {
+              if (field === "documentId") {
+                if (!Array.isArray(value)) {
+                  value = [value];
+                }
+                // For documentId filters, we need to construct the full document path
+                const fullPaths = value.map((id: string) => {
+                  // If ID is already a full path, use it directly
+                  if (id.includes("projects/")) return id;
+                  // Otherwise construct the full path
+                  return `projects/${this.GCP_PROJECT_NAME}/databases/(default)/documents/${path}/${id}`;
+                });
+                return {
+                  fieldFilter: {
+                    field: { fieldPath: "__name__" },
+                    op: FirestoreOperator.IN, // Filtering by document ID(s) requires IN operator
+                    value: {
+                      arrayValue: {
+                        values: fullPaths.map((p: any) => ({
+                          referenceValue: p,
+                        })),
+                      },
+                    },
+                  },
+                };
+              }
+              return {
+                fieldFilter: {
+                  field: { fieldPath: field },
+                  op,
+                  value: this.encodeValue(value),
+                },
+              };
+            }),
           },
         };
       }