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-rw-r--r--doc/internal/man3/OSSL_METHOD_STORE.pod6
1 files changed, 6 insertions, 0 deletions
diff --git a/doc/internal/man3/OSSL_METHOD_STORE.pod b/doc/internal/man3/OSSL_METHOD_STORE.pod
index 5d9219fd0e..e0536edff3 100644
--- a/doc/internal/man3/OSSL_METHOD_STORE.pod
+++ b/doc/internal/man3/OSSL_METHOD_STORE.pod
@@ -102,6 +102,12 @@ The I<method_up_ref> function is called to increment the
reference count of the method and the I<method_destruct> function is called
to decrement it.
+=head1 NOTES
+
+The I<prop_query> argument to ossl_method_store_cache_get() and
+ossl_method_store_cache_set() is not allowed to be NULL. Use "" for an
+empty property definition or query.
+
=head1 RETURN VALUES
ossl_method_store_new() returns a new method store object or NULL on failure.