I'm being told commas are useful occasionally

Author: pietroalbini

posts/2020-12-31-Rust-1.49.0.md

@@ -33,7 +33,7 @@ changes not covered by this post.
 
 The Rust compiler supports [a wide variety of targets][platform-support], but
 the Rust Team can't provide the same level of support for all of them. To
-clearly mark how supported each target is we created a tiering system:
+clearly mark how supported each target is, we created a tiering system:
 
 * Tier 3 targets are technically supported by the compiler, but we don't check
   whether their code build or passes the tests, and we don't provide any