diff --git a/source/_integrations/sms.markdown b/source/_integrations/sms.markdown
index a0020e95b8a..441bf582563 100644
--- a/source/_integrations/sms.markdown
+++ b/source/_integrations/sms.markdown
@@ -62,7 +62,7 @@ Need to unlock it using [this guide](http://blog.asiantuntijakaveri.fi/2015/07/c
 ### Note about Raspberry PI 4
 On Raspberry PI 4, you need a udev rule in the config USB stick, for the [Huawei E3372-510 stick](https://www.amazon.com/gp/product/B01N6P3HI2/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1) for it to be recognized.
 This config is:
-```
+```txt
 udev\10-gsm-modem.rules
 ```
 ```txt