Ruby on Rails : Comment Single line / Multiple lines

Comment single line of code is using "#", however, for multiple line is using "=begin" and "=end" in .rb, and "<!-- -->" in .rhtml.

In Controller.rb

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    # Single line
    # PUT /people/1
    # PUT /people/1.xml
    def update
      @person = Person.find(params[:id])
=begin (Multiple lines)
      respond_to do |format|
       if @person.update_attributes(params[:person])
        flash[:notice] = 'Person was successfully updated.'
        format.html { redirect_to(@person) }
        format.xml { head :ok }
       else
        format.html { render :action => "edit" }
        format.xml { render :xml => @person.errors, :status => :unprocessable_entity }
       end
      end
=end
    end

In View.rhtml

<!-- Single Line -->
<% # @people = Person.find(:all) %>

<!-- Multiple Lines -->
<!--
<% for person in @people %>
<%= person.name %>
<% end %>
-->