A network node (110) provides a first system information set to a radio device (120), The network node (110) also signals a limitation to the radio device (120). The limitation specifies a condition for requesting a second system information set from the network node (110). Correspondingly, the radio device (120) receives the first system information set and the limitation from the network node (110), and may, for example, determine whether or not to transmit a request for the second system information set based on detecting that the condition is or is not met, respectively.