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TPS63001: What do R3 & C4 do?

Part Number: TPS63001

In the typical application, there is the addition of R3 & C4. What exactly is their purpose? Originally I thought it was just power filtering bypass capacitor (as recommended in the TPS6303) with a pullup resistor, but 100 ohms is super low to be a pullup. They seem to form a 15kHz lowpass? Are they important to include? WeBench power designer does not add this components to its circuit.