Add SLA as a common initialism.
diff --git a/lint.go b/lint.go
index 28bc92d..366d254 100644
--- a/lint.go
+++ b/lint.go
@@ -448,6 +448,7 @@
 	"RAM":   true,
 	"RHS":   true,
 	"RPC":   true,
+	"SLA":   true,
 	"TTL":   true,
 	"UI":    true,
 	"UID":   true,