Correction to: Nature Electronics https://doi.org/10.1038/s41928-021-00545-5, published online 1 March 2021.

In the version of this Article originally published, in the Abstract, in the sentence beginning “Here, we report a hydrogel composite”, ‘Young’s modulus < 1 kPa’ should have read ‘Young’s modulus < 10 kPa’. All versions of the Article have been corrected.