diff --git a/hapi-fhir-base/src/main/java/ca/uhn/fhir/util/StringUtil.java b/hapi-fhir-base/src/main/java/ca/uhn/fhir/util/StringUtil.java
index d868e53198d..4f3b4da8aae 100644
--- a/hapi-fhir-base/src/main/java/ca/uhn/fhir/util/StringUtil.java
+++ b/hapi-fhir-base/src/main/java/ca/uhn/fhir/util/StringUtil.java
@@ -97,6 +97,7 @@ public class StringUtil {
 			return "";
 		}
 
+		// char count can only be bigger than the code point count
 		if (theString.length() <= theCodePointCount) {
 			return theString;
 		}