diff --git a/tools/codes_split_file.c b/tools/codes_split_file.c
index 0c2f03af4..952917e74 100644
--- a/tools/codes_split_file.c
+++ b/tools/codes_split_file.c
@@ -8,6 +8,13 @@
  * virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
  */
 
+/*
+ * Description:
+ * Split an input file (GRIB, BUFR etc) into chunks of roughly the same size.
+ * The output files are named input_01, input_02 etc. This is much faster than grib_copy/bufr_copy
+ *
+ */
+
 #include "grib_api_internal.h"
 #include <assert.h>
 
diff --git a/tools/codes_split_file.desc b/tools/codes_split_file.desc
index 6be773d29..d7245929e 100644
--- a/tools/codes_split_file.desc
+++ b/tools/codes_split_file.desc
@@ -2,7 +2,7 @@ NAME	codes_split_file
 	
 DESCRIPTION
 
-	Split an input file (GRIB, BUFR etc) into chunks of roughly the same size. The output files are named input_1, input_2 etc. This is much faster than grib_copy/bufr_copy.
+	Split an input file (GRIB, BUFR etc) into chunks of roughly the same size. The output files are named input_01, input_02 etc. This is much faster than grib_copy/bufr_copy.
 
 USAGE
 	codes_split_file [-v] nchunks input