diff --git a/src/H5Part.h b/src/H5Part.h
index 141949d..2aff471 100644
--- a/src/H5Part.h
+++ b/src/H5Part.h
@@ -61,6 +61,13 @@ H5PartCloseFile (
 
 
 /*============== File Writing Functions ==================== */
+h5part_int64_t
+H5PartDefineStepName (
+	H5PartFile *f,
+	const char *name,
+	const h5part_int64_t width
+	);
+
 h5part_int64_t
 H5PartSetNumParticles ( 
 	H5PartFile *f,