Cross reference 'key handles' from INVALID_HANDLE
diff --git a/include/psa/crypto_values.h b/include/psa/crypto_values.h
index e0600a1..0781fa4 100644
--- a/include/psa/crypto_values.h
+++ b/include/psa/crypto_values.h
@@ -268,7 +268,7 @@
  * to read from a resource. */
 #define PSA_ERROR_INSUFFICIENT_DATA     ((psa_status_t)-143)
 
-/** The key handle is not valid.
+/** The key handle is not valid. See also :ref:\`key-handles\`.
  */
 #define PSA_ERROR_INVALID_HANDLE        ((psa_status_t)-136)