1 files changed, 4 insertions, 0 deletions
diff --git a/src/H5Tpublic.h b/src/H5Tpublic.h
index 8fe400a..a6feb73 100644
--- a/src/H5Tpublic.h
+++ b/src/H5Tpublic.h
@@ -195,6 +195,10 @@ typedef struct {
 /* Variable Length String information */
 #define H5T_VARIABLE    ((size_t)(-1))  /* Indicate that a string is variable length (null-terminated in C, instead of fixed length) */
 
+/* Opaque information */
+#define H5T_OPAQUE_TAG_MAX      256     /* Maximum length of an opaque tag */
+                                        /* This could be raised without too much difficulty */
+
 #ifdef __cplusplus
 extern "C" {
 #endif