add comment to clarify the purpose of the previous change
diff --git a/bval-jsr/src/main/java/org/apache/bval/el/ELFacade.java b/bval-jsr/src/main/java/org/apache/bval/el/ELFacade.java
index 40797de..e1c96c1 100644
--- a/bval-jsr/src/main/java/org/apache/bval/el/ELFacade.java
+++ b/bval-jsr/src/main/java/org/apache/bval/el/ELFacade.java
@@ -61,6 +61,7 @@
     @Override
     public String interpolate(final String message, final Map<String, Object> annotationParameters,
         final Object validatedValue) {
+        // BVAL-170: simple pre-check to improve performance
         if (message.contains("${") || message.contains("#{")) {
             try {
                 if (EvaluationType.IMMEDIATE.regex.matcher(message).find()) {