Add documentation for DrawingGroupRecord
Documentation adapted from [MS-XLS].pdf v20190618.
git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1886619 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/java/org/apache/poi/hssf/record/DrawingGroupRecord.java b/src/java/org/apache/poi/hssf/record/DrawingGroupRecord.java
index 692dc84..68c8c24 100644
--- a/src/java/org/apache/poi/hssf/record/DrawingGroupRecord.java
+++ b/src/java/org/apache/poi/hssf/record/DrawingGroupRecord.java
@@ -22,10 +22,18 @@
import java.util.function.Supplier;
import org.apache.poi.ddf.EscherRecord;
+import org.apache.poi.ddf.EscherRecordTypes;
import org.apache.poi.ddf.NullEscherSerializationListener;
import org.apache.poi.util.LittleEndian;
-
+/**
+ * Specifies a group of drawing objects.
+ * <p>
+ * Contains a single {@link EscherRecordTypes#DGG_CONTAINER OfficeArtDggContainer} that specifies the group of drawing
+ * objects. Get the {@link org.apache.poi.ddf.EscherContainerRecord} representation via {@link #getEscherContainer()}.
+ * <p>
+ * Referred to as an {@code MsoDrawingGroup} in {@code [MS-XLS].pdf v20190618}.
+ */
public final class DrawingGroupRecord extends AbstractEscherHolderRecord {
public static final short sid = 0xEB;
