diff --git a/source/_integrations/sms.markdown b/source/_integrations/sms.markdown
index 5d9fe607d8e..feb0d9241ae 100644
--- a/source/_integrations/sms.markdown
+++ b/source/_integrations/sms.markdown
@@ -64,7 +64,7 @@ This config is:
 ```
 udev\10-gsm-modem.rules
 ```
-```
+```txt
 ACTION=="add" \
 , ATTRS{idVendor}=="12d1" \
 , ATTRS{idProduct}=="14fe" \