diff --git a/SC2155.md b/SC2155.md
index 44e2b25..b445f17 100644
--- a/SC2155.md
+++ b/SC2155.md
@@ -41,4 +41,17 @@ local foo="$(mycmd)"
 ```sh
 local foo
 foo=$(mycmd)
+```
+
+### Problematic code in the case of `readonly`:
+
+```sh
+readonly foo="$(mycmd)"
+```
+
+### Correct code:
+
+```sh
+foo="$(mycmd)"
+readonly foo
 ```
\ No newline at end of file