diff --git a/core/src/main/java/com/google/zxing/DecodeHintType.java b/core/src/main/java/com/google/zxing/DecodeHintType.java
index 90d0a3e02..a6658695e 100644
--- a/core/src/main/java/com/google/zxing/DecodeHintType.java
+++ b/core/src/main/java/com/google/zxing/DecodeHintType.java
@@ -32,7 +32,7 @@ public enum DecodeHintType {
   /**
    * Unspecified, application-specific hint. Maps to an unspecified {@link Object}.
    */
- OTHER(Object.class),
+  OTHER(Object.class),
 
   /**
    * Image is a pure monochrome image of a barcode. Doesn't matter what it maps to;
@@ -90,12 +90,13 @@ public enum DecodeHintType {
 
 
   /**
-   * Allowed extension lengths for EAN or UPC barcodes.
-   * Other formats will ignore this.
+   * Allowed extension lengths for EAN or UPC barcodes. Other formats will ignore this.
    * Maps to an {@code int[]} of the allowed extension lengths, for example [2], [5], or [2, 5].
-   * If it is optional to have an extension, do not set this hint.
+   * If it is optional to have an extension, do not set this hint. If this is set,
+   * and a UPC or EAN barcode is found but an extension is not, then no result will be returned
+   * at all.
    */
-  ALLOWED_EAN_EXTENSIONS(int[].class);
+  ALLOWED_EAN_EXTENSIONS(int[].class),
 
   // End of enumeration values.
   ;
diff --git a/core/src/main/java/com/google/zxing/oned/UPCEANReader.java b/core/src/main/java/com/google/zxing/oned/UPCEANReader.java
index 349d4632d..5316e6d53 100644
--- a/core/src/main/java/com/google/zxing/oned/UPCEANReader.java
+++ b/core/src/main/java/com/google/zxing/oned/UPCEANReader.java
@@ -206,17 +206,17 @@ public abstract class UPCEANReader extends OneDReader {
       // continue
     }
 
-    int[] allowedExtensions = hints == null ? null :
-        (int[])hints.get(DecodeHintType.ALLOWED_EAN_EXTENSIONS);
-    if(allowedExtensions != null) {
+    int[] allowedExtensions =
+        hints == null ? null : (int[]) hints.get(DecodeHintType.ALLOWED_EAN_EXTENSIONS);
+    if (allowedExtensions != null) {
       boolean valid = false;
       for (int length : allowedExtensions) {
-        if(extensionLength == length) {
+        if (extensionLength == length) {
           valid = true;
           break;
         }
       }
-      if(!valid) {
+      if (!valid) {
         throw NotFoundException.getNotFoundInstance();
       }
     }