diff --git a/cmd/prometheus/main.go b/cmd/prometheus/main.go
index 830ae4649..e36665857 100644
--- a/cmd/prometheus/main.go
+++ b/cmd/prometheus/main.go
@@ -416,7 +416,7 @@ func main() {
 	serverOnlyFlag(a, "rules.alert.resend-delay", "Minimum amount of time to wait before resending an alert to Alertmanager.").
 		Default("1m").SetValue(&cfg.resendDelay)
 
-	serverOnlyFlag(a, "rules.max-concurrent-evals", "Global concurrency limit for independent rules which can run concurrently.").
+	serverOnlyFlag(a, "rules.max-concurrent-evals", "Global concurrency limit for independent rules that can run concurrently.").
 		Default("4").Int64Var(&cfg.maxConcurrentEvals)
 
 	a.Flag("scrape.adjust-timestamps", "Adjust scrape timestamps by up to `scrape.timestamp-tolerance` to align them to the intended schedule. See https://github.com/prometheus/prometheus/issues/7846 for more context. Experimental. This flag will be removed in a future release.").