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A quick question about BRDF

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Hi, I'm reading some materials about BRDF and I've got a question about BRDF's property related to conversation of energy. Given the definition of BRDF: BRDFλ = Lo/(Licosθidwi) In order for the ratio of the total amount of reflected light to the incident light to be less than 1, we have (according to the materials I've read)
  ⌠
  ⌡ BRDFλiioo)cosθodwo <= 1
  Ω
My question is, why the cosθo is here, but not cosθi? That is, for Lo/Li <= 1, why not
  ⌠
  ⌡ BRDFλiioo)cosθidwo <= 1
  Ω
? Maybe I'm just being stupid or missing something :)

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