diff --git a/docs/Plugin API/documentscanner.md b/docs/Plugin API/documentscanner.md
new file mode 100644
index 0000000..7b944f2
--- /dev/null
+++ b/docs/Plugin API/documentscanner.md	
@@ -0,0 +1,46 @@
+<a name="documentscanner"></a>
+
+## documentscanner : <code>object</code>
+Scan documents from flatbed/ADF scanners.
+
+**Kind**: global namespace  
+
+* [documentscanner](#documentscanner) : <code>object</code>
+    * [.discoverScanners()](#documentscanner.discoverScanners) ⇒ <code>Promise.&lt;Array&gt;</code>
+    * [.scanToPDF(scannerObj, opts)](#documentscanner.scanToPDF) ⇒ <code>Promise.&lt;Blob&gt;</code>
+
+<a name="documentscanner.discoverScanners"></a>
+
+### documentscanner.discoverScanners() ⇒ <code>Promise.&lt;Array&gt;</code>
+Get a list of document scanners found on the network. Supports eSCL/AirPrint.
+
+**Kind**: static method of [<code>documentscanner</code>](#documentscanner)  
+**Example**  
+```js
+[{
+         protocol: "http",
+         host: "ip or hostname",
+         port: 80,
+         rs: "eSCL",
+         uuid: "1234etc",
+         icon: "http://hostname/icon.png", // Icon supplied by the scanner to represent itself visually to the user.
+         name: "ScanTron 9000",
+         note: "", // Whatever is set as the scanner's human-readable location in its settings
+         hasAdf: true, // Has an automatic document/page feeder
+         hasPlaten: true, // Has a flatbed
+         hasDuplex: false // Can do automatic duplex scanning
+         }]
+```
+<a name="documentscanner.scanToPDF"></a>
+
+### documentscanner.scanToPDF(scannerObj, opts) ⇒ <code>Promise.&lt;Blob&gt;</code>
+Scan a document to PDF. Supports eSCL/AirPrint.
+
+**Kind**: static method of [<code>documentscanner</code>](#documentscanner)  
+**Returns**: <code>Promise.&lt;Blob&gt;</code> - PDF file.  
+
+| Param | Type | Description |
+| --- | --- | --- |
+| scannerObj | <code>Object</code> | A scanner object from discoverScanners() |
+| opts | <code>Object</code> | Scanning options:   dpi?: number,            // default 300   colorMode?: string,      // "RGB24" | "Grayscale8" | "BlackAndWhite1", default "RGB24"   source?: string,         // Where the document is physically located: "Platen" or "Feeder". Default is "Feeder" (if scanner has one and it isn't empty) or unset (so scanner can autodetect media).   intent?: string,         // default is unset. "Document" | "TextAndGraphic" | "Photo" | "Preview"   duplex?: boolean,        // default true if the scanner supports it.   scanHeight?: number,     // Height in inches. Default 11.   scanWidth?: number       // Width in inches. Default 8.5. |
+
diff --git a/docs/Plugin API/mailboxes.md b/docs/Plugin API/mailboxes.md
index 99114a6..4095427 100644
--- a/docs/Plugin API/mailboxes.md	
+++ b/docs/Plugin API/mailboxes.md	
@@ -16,7 +16,7 @@ Add, modify, and delete mailboxes and mailbox customers.
     * [.deleteMailbox(number)](#mailboxes.deleteMailbox) ⇒ <code>Promise</code>
     * [.closeMailbox(number)](#mailboxes.closeMailbox) ⇒ <code>Promise</code>
     * [.mailboxExists(number)](#mailboxes.mailboxExists) ⇒ <code>Promise.&lt;boolean&gt;</code>
-    * [.addOrUpdateBoxholder(boxNumber, info)](#mailboxes.addOrUpdateBoxholder) ⇒ <code>Promise</code>
+    * [.addOrUpdateBoxholder(boxNumber, info, setPrimary)](#mailboxes.addOrUpdateBoxholder) ⇒ <code>Promise</code>
     * [.removeBoxholder(boxNumber, uuid)](#mailboxes.removeBoxholder) ⇒ <code>Promise</code>
     * [.get1583(boxNumber, uuid, archiveNumber)](#mailboxes.get1583) ⇒ <code>Promise.&lt;FormPS1583&gt;</code>
     * [.set1583(boxNumber, uuid, formps1583)](#mailboxes.set1583) ⇒ <code>Promise</code>
@@ -158,7 +158,7 @@ Returns true if the mailbox number exists, false if it doesn't.
 
 <a name="mailboxes.addOrUpdateBoxholder"></a>
 
-### mailboxes.addOrUpdateBoxholder(boxNumber, info) ⇒ <code>Promise</code>
+### mailboxes.addOrUpdateBoxholder(boxNumber, info, setPrimary) ⇒ <code>Promise</code>
 Modify or add a boxholder to a mailbox. info is the boxholder structure below.
 If the uuid given already belongs to a boxholder, their info is updated with what you supply.
 Otherwise, the info is added as a new boxholder.
@@ -169,6 +169,7 @@ Otherwise, the info is added as a new boxholder.
 | --- | --- | --- |
 | boxNumber | <code>string</code> | Mailbox number |
 | info | <code>Object</code> | Boxholder information. |
+| setPrimary | <code>Boolean</code> \| <code>undefined</code> | If true, this boxholder will become the primary boxholder. Default is false. |
 
 **Example**  
 ```js
diff --git a/docs/Plugin API/ui.md b/docs/Plugin API/ui.md
index 7aacd21..3ca9d17 100644
--- a/docs/Plugin API/ui.md	
+++ b/docs/Plugin API/ui.md	
@@ -236,6 +236,8 @@ if (type == "html") {
 
 ### ui.collectSignatureFromCustomerScreen(title, terms, termstype)
 Show a signature pad on the customer-facing display.
+Signature pad may appear on main employee display in some hardware configurations
+(for example, no customer display and main screen is touch-capable).
 When the customer indicates the signature is finished,
 the customerSignatureCollected event is emitted with the data
 {"svg": "data:image/svg+xml;base64,...", "png": "data:image/png;base64,..."}
@@ -281,10 +283,14 @@ global.apis.ui.clearSignaturePad();
 
 ### ui.getCustomerDisplayInfo() ⇒ <code>Object</code>
 Describes if the customer-facing display is currently enabled,
-and if it supports customer touch interaction.
+and if it supports customer touch interaction, and if it's possible to
+get a signature via `collectSignatureFromCustomerScreen()`.
+Note that it may be possible to get a signature even if `enabled` and/or `touch` are `false`,
+because if the main PostalPoint display is on a touch-capable monitor, a signature popup
+will be displayed there instead of on the customer screen.
 
 **Kind**: static method of [<code>ui</code>](#ui)  
-**Returns**: <code>Object</code> - {"enabled": true, "touch": true}  
+**Returns**: <code>Object</code> - {"enabled": true, "touch": true, "signature": true}  
 **Example**  
 ```js
 var info = global.apis.ui.getCustomerDisplayInfo();