diff --git a/include/dwarf2.h b/include/dwarf2.h
index 37cb83f..69656e6 100644
--- a/include/dwarf2.h
+++ b/include/dwarf2.h
@@ -188,7 +188,11 @@ enum dwarf_form
     DW_FORM_sec_offset = 0x17,
     DW_FORM_exprloc = 0x18,
     DW_FORM_flag_present = 0x19,
-    DW_FORM_ref_sig8 = 0x20
+    DW_FORM_ref_sig8 = 0x20,
+    /* Extensions for Fission.  See http://gcc.gnu.org/wiki/DebugFission.  */
+    DW_FORM_GNU_ref_index = 0x70,
+    DW_FORM_GNU_addr_index = 0x71,
+    DW_FORM_GNU_str_index = 0x72
   };

 /* Attribute names and codes.  */
@@ -368,6 +372,13 @@ enum dwarf_attribute
     DW_AT_GNU_all_source_call_sites = 0x2118,
     /* Section offset into .debug_macro section.  */
     DW_AT_GNU_macros = 0x2119,
+    /* Extensions for Fission.  See http://gcc.gnu.org/wiki/DebugFission.  */
+    DW_AT_GNU_dwo_name = 0x2130,
+    DW_AT_GNU_dwo_id = 0x2131,
+    DW_AT_GNU_ref_base = 0x2132,
+    DW_AT_GNU_addr_base = 0x2133,
+    DW_AT_GNU_pubnames = 0x2134,
+    DW_AT_GNU_pubtypes = 0x2135,
     /* VMS extensions.  */
     DW_AT_VMS_rtnbeg_pd_address = 0x2201,
     /* GNAT extensions.  */