--- a/FourByteString.st	Wed Aug 30 23:34:54 2017 +0200
+++ b/FourByteString.st	Thu Aug 31 14:51:34 2017 +0200
@@ -132,7 +132,13 @@
 
 !FourByteString methodsFor:'testing'!
 
-isByteCollection
+isSingleByteCollection
+    "return true, if the receiver has access methods for bytes;
+     i.e. #at: and #at:put: accesses a byte and are equivalent to #byteAt: and byteAt:put:
+     and #replaceFrom:to: is equivalent to #replaceBytesFrom:to:. 
+     false is returned here since at: returns 4-byte characters and not bytes 
+      - the method is redefined from UninterpretedBytes."
+
     ^ false
 
     "Created: / 30-08-2017 / 23:31:02 / cg"