1 files changed, 5 insertions, 1 deletions
diff --git a/src/H5Dpkg.h b/src/H5Dpkg.h
index 30183c3..8b88e92 100644
--- a/src/H5Dpkg.h
+++ b/src/H5Dpkg.h
@@ -93,8 +93,12 @@ struct H5D_t {
     H5O_fill_t          fill;           /* Dataset fill value information */
 
     /* Buffered/cached information for types of raw data storage*/
-    union {
+    struct {
         H5D_rdcdc_t     contig;         /* Information about contiguous data */
+                                        /* (Note that the "contig" cache
+                                         * information can be used by a chunked
+                                         * dataset in certain circumstances)
+                                         */
         H5D_rdcc_t      chunk;          /* Information about chunked data */
     }cache;
 };