diff --git a/README.md b/README.md
index 6f5bc5dce..b769d4ffc 100644
--- a/README.md
+++ b/README.md
@@ -173,6 +173,30 @@ the Research Gallery, which DX Life publishes as **Deep Research**. An eighth pr
 </tr>
 </table>
 
+### Print your first poster
+
+1. **Open a poster wall:** *UPG-100 List*, *Country Posters*, or *Regions* (its **View country posters**
+   button). Every card on the wall has a **Print Options** strip. India's whole-country poster isn't
+   available yet; its state posters are.
+2. **Pick what to print:** **Poster Map** (the poster), **Prayer List** (choose **Full detail** or
+   **Lightweight**) or **Card Deck** (choose a card size). On *UPG-100 List*, clicking the poster
+   picture prints it too.
+3. **Your browser's print window opens, and it is the preview.** Choose the printer and print. Nothing
+   is downloaded; to keep a file, choose **Save as PDF** instead of a printer.
+
+Posters, lists and packets print on Letter-size pages (8.5 × 11 in). Cards print at their own size:
+2.5 × 3.5 in, 4 × 6 in or A6.
+
+**Bigger posters.** *Bible Posters* and the *Wall of People Groups* also offer bigger sizes, up to 5 × 8
+ft, for a print shop: in the print window choose **Save as PDF** and send the file. The Wall's 5 × 8 ft
+poster prints as 3 sheets, one per page, stacked so that each overlaps the next by 6 in; every sheet is
+numbered (1 / 3, 2 / 3 …) and marked **glue here** where the next one goes.
+
+**On a phone.** The same print window rises over the page; choose **Save as PDF** to keep the file or
+send it on. A phone prints page sizes only (Letter or A4 paper), and the largest poster sizes are
+switched off there. A few prints say they need a computer: *Bless India Posters*, the *Wall of People
+Groups* and a UPG-100 selection of more than 1,000 groups.
+
 ### Every capability ships every way
 
 | Capability | Example | iframe | Mobile app | JavaScript embed | WordPress / Disciple Tools | Desktop |
diff --git a/library/packet/scripts/check-circular-layout.mjs b/library/packet/scripts/check-circular-layout.mjs
index f7f88f63f..b63ff7513 100644
--- a/library/packet/scripts/check-circular-layout.mjs
+++ b/library/packet/scripts/check-circular-layout.mjs
@@ -214,7 +214,7 @@ const HEAP_CEIL_MB = 300;
 const times = [];
 let heapDelta = 0;
 for (let k = 0; k < 3; k++) {
-  if (global.gc) global.gc();
+  if (globalThis.gc) globalThis.gc();
   const h0 = process.memoryUsage().heapUsed;
   const t0 = process.hrtime.bigint();
   await layoutCircular({ pins, states: null, box, mode: 'fourSides', opts: optsBase });