From e0a75d5f596a9c3bb4dad6645436f0da689c0364 Mon Sep 17 00:00:00 2001
From: Paul Liu <paul@dfinity.org>
Date: Thu, 25 Jan 2024 02:29:37 +0800
Subject: [PATCH] fix: wrong new_pages calculation in StableMultiLog (#4370)

Fix the wrong calculation on the new pages needed to grow stable memory in the StableMultiLog example used in our documentation.
---
 doc/md/examples/StableMultiLog.mo | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/md/examples/StableMultiLog.mo b/doc/md/examples/StableMultiLog.mo
index f1e2f99c1d4..478873d7f7e 100644
--- a/doc/md/examples/StableMultiLog.mo
+++ b/doc/md/examples/StableMultiLog.mo
@@ -20,7 +20,7 @@ actor StableLog {
   func regionEnsureSizeBytes(r : Region, new_byte_count : Nat64) {
     let pages = Region.size(r);
     if (new_byte_count > pages << 16) {
-      let new_pages = pages - ((new_byte_count + ((1 << 16) - 1)) / (1 << 16));
+      let new_pages = ((new_byte_count + ((1 << 16) - 1)) / (1 << 16)) - pages;
       assert Region.grow(r, new_pages) == pages
     }
   };