diff --git a/SC2019.md b/SC2019.md
index 044e70f..dda4bf3 100644
--- a/SC2019.md
+++ b/SC2019.md
@@ -1,3 +1,3 @@
-## Use '[:upper:]' to support accents and foreign alphabets.
+## Use `[:upper:]` to support accents and foreign alphabets.
 
 See the equivalent warning for lowercase matching: [[SC2018]]
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