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usage/paragraph.md

@@ -305,4 +305,12 @@ Example: https://github.com/dolanmiu/docx/blob/master/demo/15-page-break-before.
 
 ## Page break control
 
-Paragraphs have `.keepLines()` and `.keepNext()` methods that allow restricting page breaks within and between paragraphs. See [this Microsoft article](https://support.office.com/en-us/article/Keep-lines-and-paragraphs-together-d72af534-926f-4c4b-830a-abfc2daa3bfa) for more details)
+Paragraphs have `keepLines` and `keepNext` properties that allow restricting page breaks within and between paragraphs. See [this Microsoft article](https://support.office.com/en-us/article/Keep-lines-and-paragraphs-together-d72af534-926f-4c4b-830a-abfc2daa3bfa) for more details.
+
+```ts
+const paragraph = new Paragraph({
+    text: "Stay on the same page",
+    keepLines: true,
+    keepNext: true,
+});
+```

usage/patcher.md

@@ -0,0 +1,94 @@
+# Patcher
+
+The patcher allows you to modify existing documents, and add new content to them.
+
+!> The Patcher requires an understanding of [Paragraphs](usage/paragraph.md).
+
+---
+
+## Usage
+
+```ts
+import * as fs from "fs";
+import { patchDocument } from "docx";
+
+patchDocument(fs.readFileSync("My Document.docx"), {
+    patches: {
+        // Patches here
+    },
+});
+```
+
+## Patches
+
+The patcher takes in a `patches` object, which is a map of `string` to `Patch`:
+
+```ts
+interface Patch {
+    type: PatchType;
+    children: FileChild[] | ParagraphChild[];
+}
+```
+
+| Property | Type                              | Notes    | Possible Values                                                                                                                      |
+| -------- | --------------------------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------ |
+| type     | `PatchType`                       | Required | `DOCUMENT`, `PARAGRAPH`                                                                                                              |
+| children | `FileChild[] or ParagraphChild[]` | Required | The contents to replace with. A `FileChild` is a `Paragraph` or `Table`, whereas a `ParagraphChild` is typical `Paragraph` children. |
+
+### How to patch existing document
+
+1. Open your existing word document in your favorite Word Processor
+2. Write tags in the document where you want to patch in a mustache style notation. For example, `{{my_patch}}` and `{{my_second_patch}}`.
+3. Run the patcher with the patches as a key value pair.
+
+## Example
+
+### Word Document
+
+![Word Document screenshot](https://i.imgur.com/ybkvw6Z.png)
+
+### Patcher
+
+?> Notice how there is no handlebar notation in the key.
+
+The patch can be as simple as a string, or as complex as a table. Images, hyperlinks, and other complex elements within the `docx` library are also supported.
+
+```ts
+patchDocument(fs.readFileSync("My Document.docx"), {
+    patches: {
+        my_patch: {
+            type: PatchType.PARAGRAPH,
+            children: [new TextRun("Sir. "), new TextRun("John Doe"), new TextRun("(The Conqueror)")],
+        },
+        my_second_patch: {
+            type: PatchType.DOCUMENT,
+            children: [
+                new Paragraph("Lorem ipsum paragraph"),
+                new Paragraph("Another paragraph"),
+                new Paragraph({
+                    children: [
+                        new TextRun("This is a "),
+                        new ExternalHyperlink({
+                            children: [
+                                new TextRun({
+                                    text: "Google Link",
+                                }),
+                            ],
+                            link: "https://www.google.co.uk",
+                        }),
+                        new ImageRun({ data: fs.readFileSync("./demo/images/dog.png"), transformation: { width: 100, height: 100 } }),
+                    ],
+                }),
+            ],
+        },
+    },
+});
+```
+
+---
+
+## Demo
+
+_Source: https://github.com/dolanmiu/docx/blob/master/demo/85-template-document.ts_
+
+[Example](https://raw.githubusercontent.com/dolanmiu/docx/master/demo/85-template-document.ts ":include :type=code typescript")