diff --git a/tests/grib_ecc-604-1.c b/tests/grib_ecc-604-1.c
index fb4f72982..d50ec7958 100644
--- a/tests/grib_ecc-604-1.c
+++ b/tests/grib_ecc-604-1.c
@@ -1,5 +1,5 @@
 /*
- * Test for ECC-604:
+ * Test for ECC-604: Each thread creates a new GRIB handle, clones it and writes it out
  */
 #include <time.h>
 #include <pthread.h>
@@ -99,6 +99,7 @@ int main(int argc, char **argv)
     }
     if (parallel) {
         printf("Running parallel in %ld threads. %ld iterations\n", NUM_THREADS, FILES_PER_ITERATION);
+        printf("Each thread creates a new GRIB handle, clones it and writes it out\n");
     } else {
         printf("Running sequentially in %ld runs. %ld iterations\n", NUM_THREADS, FILES_PER_ITERATION);
     }
diff --git a/tests/grib_ecc-604-2.c b/tests/grib_ecc-604-2.c
index 331edbf5d..fc15d1206 100644
--- a/tests/grib_ecc-604-2.c
+++ b/tests/grib_ecc-604-2.c
@@ -1,5 +1,6 @@
 /*
- * Test for ECC-604: This version does not clone the GRIB handle
+ * Test for ECC-604: Each thread creates a new GRIB handle and writes it out.
+ *                   It does not clone the handle.
  */
 
 #include <time.h>
@@ -96,6 +97,7 @@ int main(int argc, char **argv)
     }
     if (parallel) {
         printf("Running parallel in %ld threads. %ld iterations\n", NUM_THREADS, FILES_PER_ITERATION);
+        printf("Each thread creates a new GRIB handle and writes it out. No cloning the handle\n");
     } else {
         printf("Running sequentially in %ld runs. %ld iterations\n", NUM_THREADS, FILES_PER_ITERATION);
     }
diff --git a/tests/grib_ecc-604-3.c b/tests/grib_ecc-604-3.c
index a84d4ad4e..84b1b5654 100644
--- a/tests/grib_ecc-604-3.c
+++ b/tests/grib_ecc-604-3.c
@@ -1,5 +1,6 @@
 /*
- * Test for ECC-604: No output writing
+ * Test for ECC-604: Each thread creates a new GRIB handle and clones it.
+ *                   No output writing.
  */
 #include <time.h>
 #include <pthread.h>
@@ -94,6 +95,7 @@ int main(int argc, char **argv)
     }
     if (parallel) {
         printf("Running parallel in %ld threads. %ld iterations\n", NUM_THREADS, FILES_PER_ITERATION);
+        printf("Each thread creates a new GRIB handle and clones it. No output writing\n");
     } else {
         printf("Running sequentially in %ld runs. %ld iterations\n", NUM_THREADS, FILES_PER_ITERATION);
     }