diff --git a/SC2004.md b/SC2004.md
index e363b84..1ebfe7c 100644
--- a/SC2004.md
+++ b/SC2004.md
@@ -24,4 +24,4 @@ $ echo $((a * 5))     # evaluates as (1+1)*5
 10
 ```
 
-The `$` is unavoidable for special variables like `$1` vs `1`, `$#` vs `#`. ShellCheck does not warn about these cases.
+The `$` is unavoidable for special variables like `$1` vs `1`, `$#` vs `#`. It's also required when adding modifiers to parameters expansions, like `${#var}` or `${var%-}`. ShellCheck does not warn about these cases.