diff --git a/SC1102.md b/SC1102.md
index 9573363..2df6a54 100644
--- a/SC1102.md
+++ b/SC1102.md
@@ -1,4 +1,4 @@
-## Shells disambiguate $(( differently or not at all. If the first $( should start command substitution, add a space after it.
+## Shells disambiguate `$((` differently or not at all. For `$(command substition)`, add space after `$(` . For `$((arithmetics))`, fix parsing errors.
 
 ### Problematic code: