A Supplemental is always required when the City of Encinitas puts anything on the Ballot re Voting for Zoning Changes. This additional information is triggered as a condition of Proposition A – in an attempt to make sure that Voters are fully informed. The Supplemental for Measure U is 149 pages!
And of course, in the fine print lies the devil details...
from the Supplemental: City of Encinitas, Measure U:
PROGRAM 3C: Right to Vote Amendment pg. 1-25
In 2013, a citizen initiative resulted in the Right to Vote Amendment (Proposition A), which requires voter approval of most land use changes and building heights higher than two stories. Proposition A cannot be modified except by another vote of the people. If a proposed Housing Element does not achieve community support, Proposition A may act as a constraint on the City’s ability to comply with state Housing Element law. Assuming that this Housing Element is approved in November 2018, the City will take actions to ensure that future Housing Elements can be adopted in a timely fashion and that requirements for a vote of the people do not constrain the City’s compliance with State Law. (per Supplemental pg. 1-25 Program 3C)
(emphasis added!)