ProjectSkyfire/SkyFireEMU_rebase — comment on commit 7113ffd6c1f39358375a790dab17b649db21d101
File: src/server/game/Spells/SpellEffects.cpp line 705
By cmaranec:

Shield of Righteousness (since Cataclysm it's name is Shield of Righteous) is no longer based on shield block value. Now has base value which scales with holy power chages lineary (BASE * (HOLYPOWER-1) * 3)