diff --git a/include/libdivecomputer/parser.h b/include/libdivecomputer/parser.h
index 032e92a..29befdd 100644
--- a/include/libdivecomputer/parser.h
+++ b/include/libdivecomputer/parser.h
@@ -112,9 +112,29 @@ typedef enum parser_sample_event_t {
 typedef enum parser_sample_flags_t {
 	SAMPLE_FLAGS_NONE = 0,
 	SAMPLE_FLAGS_BEGIN = (1 << 0),
-	SAMPLE_FLAGS_END = (1 << 1)
+	SAMPLE_FLAGS_END = (1 << 1),
+	SAMPLE_FLAGS_SEVERITY_MASK = (7 << 2),
 } parser_sample_flags_t;
 
+#define SAMPLE_FLAGS_SEVERITY_SHIFT 2
+
+#define SAMPLE_FLAGS_SEVERITY_MISSING (0 << SAMPLE_FLAGS_SEVERITY_SHIFT)
+#define SAMPLE_FLAGS_SEVERITY_STATE   (1 << SAMPLE_FLAGS_SEVERITY_SHIFT)
+#define SAMPLE_FLAGS_SEVERITY_INFO    (2 << SAMPLE_FLAGS_SEVERITY_SHIFT)
+#define SAMPLE_FLAGS_SEVERITY_WARN    (3 << SAMPLE_FLAGS_SEVERITY_SHIFT)
+#define SAMPLE_FLAGS_SEVERITY_ALARM   (4 << SAMPLE_FLAGS_SEVERITY_SHIFT)
+
+/* these are used for the types of TAGs in Shearwater PNF info events */
+#define SAMPLE_FLAGS_TYPE_SHIFT 5
+#define SAMPLE_FLAGS_TYPE_MASK        (7 << SAMPLE_FLAGS_TYPE_SHIFT)
+#define SAMPLE_FLAGS_TYPE_NONE        (0 << SAMPLE_FLAGS_TYPE_SHIFT)
+#define SAMPLE_FLAGS_TYPE_INTEREST    (1 << SAMPLE_FLAGS_TYPE_SHIFT)
+#define SAMPLE_FLAGS_TYPE_NAVPOINT    (2 << SAMPLE_FLAGS_TYPE_SHIFT)
+#define SAMPLE_FLAGS_TYPE_DANGER      (3 << SAMPLE_FLAGS_TYPE_SHIFT)
+#define SAMPLE_FLAGS_TYPE_ANIMAL      (4 << SAMPLE_FLAGS_TYPE_SHIFT)
+#define SAMPLE_FLAGS_TYPE_ISSUE       (5 << SAMPLE_FLAGS_TYPE_SHIFT)
+#define SAMPLE_FLAGS_TYPE_INJURY      (6 << SAMPLE_FLAGS_TYPE_SHIFT)
+
 typedef enum parser_sample_vendor_t {
 	SAMPLE_VENDOR_NONE,
 	SAMPLE_VENDOR_UWATEC_ALADIN,