diff --git a/libdw/libdw.h b/libdw/libdw.h
index 75998e1..bd764a3 100644
--- a/libdw/libdw.h
+++ b/libdw/libdw.h
@@ -288,12 +288,22 @@
 /* Get the data block for the .debug_info section.  */
 extern Elf_Data *dwarf_getscn_info (Dwarf *dwarf);
 
-/* Read the header for the DWARF CU header.  */
+/* Read the header for the DWARF CU.  */
 extern int dwarf_nextcu (Dwarf *dwarf, Dwarf_Off off, Dwarf_Off *next_off,
 			 size_t *header_sizep, Dwarf_Off *abbrev_offsetp,
 			 uint8_t *address_sizep, uint8_t *offset_sizep)
      __nonnull_attribute__ (3);
 
+/* Read the header of a DWARF CU or type unit.  If TYPE_SIGNATUREP is not
+   null, this reads a type unit from the .debug_types section; otherwise
+   this reads a CU from the .debug_info section.  */
+extern int dwarf_next_unit (Dwarf *dwarf, Dwarf_Off off, Dwarf_Off *next_off,
+			    size_t *header_sizep, uint16_t *versionp,
+			    Dwarf_Off *abbrev_offsetp,
+			    uint8_t *address_sizep, uint8_t *offset_sizep,
+			    uint64_t *type_signaturep, Dwarf_Off *type_offsetp)
+     __nonnull_attribute__ (3);
+
 
 /* Decode one DWARF CFI entry (CIE or FDE) from the raw section data.
    The E_IDENT from the originating ELF file indicates the address