diff --git a/SC2019.md b/SC2019.md
index c91422c..044e70f 100644
--- a/SC2019.md
+++ b/SC2019.md
@@ -1,13 +1,3 @@
 ## Use '[:upper:]' to support accents and foreign alphabets.
 
-### Problematic code:
-
-```sh
-PLATFORM="$(uname -s | tr 'A-Z')"
-```
-
-### Correct code:
-
-```sh
-PLATFORM="$(uname -s | tr '[:upper:]')"
-```
\ No newline at end of file
+See the equivalent warning for lowercase matching: [[SC2018]]
\ No newline at end of file