diff --git a/docs/guides/BUILDING.md b/docs/guides/BUILDING.md
index 00bf6d97a581f9..10fe92958e4b55 100644
--- a/docs/guides/BUILDING.md
+++ b/docs/guides/BUILDING.md
@@ -7,7 +7,7 @@ that generates inputs to [ninja](https://ninja-build.org/).
 Tested on:
 
 -   macOS 10.15
--   Debian 11
+-   Debian 11 (64 bit required)
 -   Ubuntu 22.04 LTS
 
 Build system features: