Adding curvature

Volume 4 - Reading 23 - Page 172 (at the bottom)

CFAI says : “When the yield curve is adding curvature in a rising rate environment, yields on the 5s to 10s may be expected to rise more than the yields on the 2s and the 30s, and when adding curvature in a declining rate environment, the yields on 5s and 10s will fall less than the yields on the 2s and 30s”

Anyone can elaborate more on this please ?

I got it !