In Energy Policy, 38 (7) 3297-3308, Dusonchet and Telaretti contribute a significant deal to the field of PV comparative policy analysis in the EU by addressing the impact of the PV regulatory framework on the investment decisions of the sector-as determined by net present value (NPV) and internal rate of return (IRR) indices-in seventeen Western EU countries. As a necessary first step, the authors bring off a concise and straightforward analysis of the different legal frameworks ruling solar PVS implementation in those countries. In the specific case of Spain we have identified some imprecision that could lead to misunderstandings about the role and impact of the PV legal framework on the massive expansion of the sector, especially during the so-called "Spanish PV Boom". This note is intended to add on the authors' primary and challenging effort to provide a systematic analysis of the Spanish PV sector by contextualizing this period of hype and, on the basis of this analysis, contribute our own understanding about how the complexity and uncertainties generated by the successive frameworks might have triggered such a frenzied response by the market. (C) 2012 Elsevier Ltd. All rights reserved.