diff --git a/doc/man3/EVP_RAND.pod b/doc/man3/EVP_RAND.pod
index c2940a3455..97114af0fb 100644
--- a/doc/man3/EVP_RAND.pod
+++ b/doc/man3/EVP_RAND.pod
@@ -311,6 +311,12 @@ or the properties in the case of B<OSSL_RAND_PARAM_PROPERTIES>.
 
 =back
 
+=head1 NOTES
+
+An B<EVP_RAND_CTX> needs to have locking enabled if it acts as the parent of
+more than one child and the children can be accessed concurrently.  This must
+be done by explicitly calling EVP_RAND_enable_locking().
+
 =head1 RETURN VALUES
 
 EVP_RAND_fetch() returns a pointer to a newly fetched B<EVP_RAND>, or