Add comment to indicate non-PSA spec assertion.

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/tests/suites/test_suite_psa_crypto.function b/tests/suites/test_suite_psa_crypto.function
index 5379eaf..c79217f 100644
--- a/tests/suites/test_suite_psa_crypto.function
+++ b/tests/suites/test_suite_psa_crypto.function
@@ -6539,6 +6539,10 @@
 
         if (status == PSA_SUCCESS || status == PSA_OPERATION_INCOMPLETE) {
             num_ops = psa_sign_hash_get_num_ops(&operation);
+            /* We are asserting here that every complete makes progress
+             * (completes some ops), which is true of the internal
+             * implementation and probably any implementation, however this is
+             * not mandated by the PSA specification. */
             TEST_ASSERT(num_ops > num_ops_prior);
 
             num_ops_prior = num_ops;
@@ -6694,6 +6698,10 @@
         if (actual_status == PSA_SUCCESS ||
             actual_status == PSA_OPERATION_INCOMPLETE) {
             num_ops = psa_sign_hash_get_num_ops(&operation);
+            /* We are asserting here that every complete makes progress
+             * (completes some ops), which is true of the internal
+             * implementation and probably any implementation, however this is
+             * not mandated by the PSA specification. */
             TEST_ASSERT(num_ops > num_ops_prior);
 
             num_ops_prior = num_ops;
@@ -7022,6 +7030,10 @@
 
         if (status == PSA_SUCCESS || status == PSA_OPERATION_INCOMPLETE) {
             num_ops = psa_verify_hash_get_num_ops(&operation);
+            /* We are asserting here that every complete makes progress
+             * (completes some ops), which is true of the internal
+             * implementation and probably any implementation, however this is
+             * not mandated by the PSA specification. */
             TEST_ASSERT(num_ops > num_ops_prior);
 
             num_ops_prior = num_ops;
@@ -7151,6 +7163,10 @@
         if (actual_status == PSA_SUCCESS ||
             actual_status == PSA_OPERATION_INCOMPLETE) {
             num_ops = psa_verify_hash_get_num_ops(&operation);
+            /* We are asserting here that every complete makes progress
+             * (completes some ops), which is true of the internal
+             * implementation and probably any implementation, however this is
+             * not mandated by the PSA specification. */
             TEST_ASSERT(num_ops > num_ops_prior);
 
             num_ops_prior = num_ops;