def _ConditionHelpText(intro):
  """Get the help text for --condition."""
  help_text = """
{intro}

*expression*::: (Required) Expression of the condition which
evaluates to True or False. This uses a subset of Common Expression
Language syntax.

*title*::: (Required) Title for the expression, i.e. a short string
describing its purpose.

*description*::: (Optional) Description for the expression. This is
a longer text which describes the expression.

NOTE: An unsatisfied condition will not allow access via this
binding.""".format(intro=intro)
  return help_text