Handlebars supports multiple code comment styles in a unique way. Be cautious about selecting the style of code comment as the end braces }} may be interpreted differently based on placement. Use of the exclamation point is critical in commenting out either an individual expression or several lines of code:
{{#each custom_fields}}{{name}}{{!address}}{{!city}}{{!state}}{{!zip}}
Standard Handlebars expression:
{{expression}}
Handlebars commented expression:
{{!expression}} (note the exclamation !)
Standard Handlebars code comment:
{{!-- Your comment here --!}}
{{! This comment will not show up in the output }}
{{!-- This comment will not show in the output --!}
{{! --This {{!comment}} will not show up in the output }}
{{! --This {{comment}} may result in the compiler evaluating everything
after the second set of braces }} and thus throwing a compilation error.