Update

syntax/modules/sflow.vim

@@ -0,0 +1,8 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'nginx') == -1
+  
+" SFlow Module <https://github.com/sflow/nginx-sflow-module>
+" A binary, random-sampling nginx module designed for: lightweight, centralized, continuous, real-time monitoring of very large and very busy web farms.
+syn keyword ngxDirectiveThirdParty sflow
+
+
+endif