diff --git a/Inst_eddies/inst_eddies.py.in b/Inst_eddies/inst_eddies.py.in
index 8f79c800e102490e5ea0fa93b247767956140de6..30b65aa42815af7567c027e420d8422741c5b53f 100644
--- a/Inst_eddies/inst_eddies.py.in
+++ b/Inst_eddies/inst_eddies.py.in
@@ -89,6 +89,6 @@ if __name__ == "__main__":
     argparser.add_argument("-b", "--bbox", nargs=4, type = float,
                            metavar = ("xmin", "xmax", "ymin", "ymax"))
     args = argparser.parse_args()
-    d = input("Enter first date (integer value):")
+    d = input("Enter first date index (integer value):")
     d = int(d)
     loop_inst_eddies(args.file, args.bbox, d)
diff --git a/Inst_eddies/inst_eddies_Aviso.py b/Inst_eddies/inst_eddies_Aviso.py
index 33b05083a4bde8a5bd26cc98881f62c7035f34b0..9e8eac4deb5d189f36c443a1fd1018a9c1d136b4 100644
--- a/Inst_eddies/inst_eddies_Aviso.py
+++ b/Inst_eddies/inst_eddies_Aviso.py
@@ -34,7 +34,10 @@ argparser.add_argument("-b", "--bbox", nargs=4, type = float,
                        metavar = ("xmin", "xmax", "ymin", "ymax"))
 args = argparser.parse_args()
 
-# Get the first date from the time coordinate in the NetCDF file:
+# Get the first date from the time coordinate in the NetCDF file. (In
+# general, we cannot get it from the name of the first file because
+# the first file may be the only file, and then there is no template
+# option and the file name could not contain the date.)
 with netCDF4.Dataset(args.first_file) as f:
     d = f["time"][:].item()
 
@@ -52,6 +55,7 @@ if args.last_date:
 else:
     last_date = first_date
 
+# We choose to use d as the first date index. We could choose anything.
 inst_eddies.loop_inst_eddies(filename_generator(args.first_file, first_date,
                                                 last_date, args.template,
                                                 dirname), args.bbox, d)
diff --git a/Overlap/Tests/short_tests.json b/Overlap/Tests/short_tests.json
index 3b5ba86a6f7eb28f74433272f77a9b9ca9a6409b..dae5256e0b6b4dff428dade6f9139956f1a66a7a 100644
--- a/Overlap/Tests/short_tests.json
+++ b/Overlap/Tests/short_tests.json
@@ -573,7 +573,7 @@
     {
         "input": "&main_nml /\n",
         "title": "Read_snapshot_15",
-	"description": "Read a snapshot from an SHPC with a sufficient number of dates: 15. $tests_old_dir/Extraction_eddies_region_4/SHPC_anti used by the test Read_snapshot has only 2 dates.",
+	"description": "Read a snapshot from an SHPC on a very small region with a sufficient number of dates: 15. $tests_old_dir/Extraction_eddies_region_4/SHPC_anti used by the test Read_snapshot has only 2 dates.",
         "commands": [
             [
                 "mkdir",
diff --git a/Overlap/eddy_graph.sh.in b/Overlap/eddy_graph.sh.in
index eb46ba94501e053a4fc1426d9c32f59b1028ab89..30afb733f10dc06c8648af531063bfa2bc58bf8a 100644
--- a/Overlap/eddy_graph.sh.in
+++ b/Overlap/eddy_graph.sh.in
@@ -5,7 +5,7 @@
 
 if (($# != 2))
 then
-    echo "Usage: eddy_graph.sh N_PROC INPUT_SHPC"
+    echo "Usage: eddy_graph.sh N_PROC SHPC-directory [SHPC-directory] ..."
     exit 1
 fi