A pedagogical discussion of the charge symmetry breaking effect in light hypernuclei is provided. The topic is addressed because recent hypernuclear decay measurements at the electron accelerator MAMI in Germany and at the J-PARC hadron hall in Japan combined with older nuclear emulsion data independently confirmed the existence of Λ binding energy differences between the lightest mirror pair of hypernuclei in the ground and in the excited states. In this particular pair ( 4 Λ He, 4 Λ H) charge

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... symmetry breaking appears to be considerably stronger than in any other nuclei or heavier hypernuclei. This article is not intended to be a comprehensive overview of these experiments and their results which already have been published in the last year.