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+++ b/readme.md
@@ -70,3 +70,9 @@ can easily spot when a string value is used instead of a numeric.
 By analysing the branchs, the application can spot the block where no `gt`
 instructions are given, which can lead to dead end in the code.
 
+### Nested string
+
+The application will report text strings containing only one expression with a
+`debug` message.
+
+For example `"<<$variable>>"` can be written directly: `$variable>`.