diff --git a/doc/guix.texi b/doc/guix.texi
index 7c5613ef96..9d850c62f3 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -3601,7 +3601,7 @@ The installation image described above was built using the @command{guix
 system} command, specifically:
 
 @example
-guix system disk-image --image-size=800MiB gnu/system/install.scm
+guix system disk-image --image-size=850MiB gnu/system/install.scm
 @end example
 
 @xref{Invoking guix system}, for more information.  See