diff --git a/platform-eql-grammar/src/main/java/fielden/platform/eql/fling/BnfToHtml.java b/platform-eql-grammar/src/main/java/fielden/platform/eql/fling/BnfToHtml.java
index 11ab34e0e3..d3c23ddbf6 100644
--- a/platform-eql-grammar/src/main/java/fielden/platform/eql/fling/BnfToHtml.java
+++ b/platform-eql-grammar/src/main/java/fielden/platform/eql/fling/BnfToHtml.java
@@ -89,6 +89,12 @@ protected DomContent makeStyle() {
                 }
                 """.formatted(DELIMITER_ROW_CLASS));
 
+        sb.append("""
+                .%s {
+                  color: gray;
+                }
+                """.formatted(PARAMETER_CLASS));
+
         return style(sb.toString());
     }