Why did the kernel version numbering change in RHEL 5.11

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Issue

In errata RHSA-2014:1959 kernel update for RHEL 5.11 was released with kernel version kernel-2.6.18-400.el5.x86_64
Why does the kernel version in RHEL 5.11 change? This was never the case before in RHEL 5.10 and earlier
We were exepcting a kernel version for kernel updates, similar to kernel-2.6.18-398.X.Y.el5 in RHEL 5.11. Why has this changed?

Environment

Red Hat Enterprise Linux 5.11 (RHEL)

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