In traditional Ashkenazi siddurim, you'll find this instruction, right before Sh'ma Yisrael: "when praying in private, add 'El Melekh Ne'eman.'" Is this a big deal? Well, when you say "El Melekh Ne'eman" you're adding material to k'ri'at Sh'ma (the recitation of Sh'ma and its accompanying b'rakhot), without any authorization in the classical sources, and the halakhah has a big problem with that. It shouldn't be there... but it is! And that fact tells us something about the capacity of Jewish law to change, to accommodate itself to the needs of those who pray. So yes, it is ​a big deal!

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