diff --git a/in/public/packages/apt/configure.rst b/in/public/packages/apt/configure.rst
index f799696..d9fa964 100644
--- a/in/public/packages/apt/configure.rst
+++ b/in/public/packages/apt/configure.rst
@@ -45,15 +45,15 @@ Configuration
 
 ::
 
-  deb https://deb.debian.org/debian stretch main contrib non-free
-  deb https://deb.debian.org/debian stretch-backports main contrib non-free
-  deb https://deb.debian.org/debian stretch-updates main contrib non-free
-  deb https://deb.debian.org/debian-security stretch/updates main contrib non-free
+  deb [arch=amd64,i386] https://deb.debian.org/debian stretch main contrib non-free
+  deb [arch=amd64,i386] https://deb.debian.org/debian stretch-backports main contrib non-free
+  deb [arch=amd64,i386] https://deb.debian.org/debian stretch-updates main contrib non-free
+  deb [arch=amd64,i386] https://deb.debian.org/debian-security stretch/updates main contrib non-free
 
-  deb https://deb.debian.org/debian buster main contrib non-free
-  deb https://deb.debian.org/debian-security buster/updates main contrib non-free
+  deb [arch=amd64,i386] https://deb.debian.org/debian buster main contrib non-free
+  deb [arch=amd64,i386] https://deb.debian.org/debian-security buster/updates main contrib non-free
 
-  deb https://deb.debian.org/debian sid main contrib non-free
+  deb [arch=amd64,i386] https://deb.debian.org/debian sid main contrib non-free
 
 .. warning::