diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 8312c07..a8f3674 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -1000,6 +1000,13 @@
 {
     psa_status_t status = psa_remove_key_data_from_memory( slot );
 
+   /*
+    * As the return error code may not be handled in case of multiple errors,
+    * do our best to report an unexpected lock counter: if available call
+    * MBEDTLS_TEST_HOOK_TEST_ASSERT that may terminate execution (if called as
+    * part of the execution of a test suite this will stop the test suite
+    * execution).
+    */
     if( slot->lock_count != 1 )
     {
         MBEDTLS_TEST_HOOK_TEST_ASSERT( slot->lock_count == 1 );