diff --git a/include/psa/crypto.h b/include/psa/crypto.h
index 271fb99..a8fe59a 100644
--- a/include/psa/crypto.h
+++ b/include/psa/crypto.h
@@ -264,6 +264,12 @@
  * - An algorithm value permits this particular algorithm.
  * - An algorithm wildcard built from #PSA_ALG_ANY_HASH allows the specified
  *   signature scheme with any hash algorithm.
+ * - An algorithm value for which PSA_ALG_IS_WILDCARD() evaluates to true
+ *   allows any algorithm specified by that usage algorithm definition.
+ *   E.g. a usage algorithm built from PSA_ALG_MAC_WITH_MINIMUM_LENGTH_TAG()
+ *   allows using the key for any algorithm with the same base MAC algorithm as
+ *   long as the used algorithm isn't truncated to less than the minimum tag
+ *   length declared in the usage algorithm.
  *
  * This function overwrites any algorithm policy
  * previously set in \p attributes.