private String descriptionFromAnnotation(String optionName,
			org.springframework.xd.module.options.spi.ModuleOption annotation) {
		Assert.hasLength(
				annotation.value(),
				String.format(
						"Setter method for option '%s' needs to bear the @%s annotation and provide a non-empty description",
						optionName,
						org.springframework.xd.module.options.spi.ModuleOption.class.getSimpleName()));
		return annotation.value();
	}
Read the description from the value() attribute of the annotation on the getter.
spring-xd-module/src/main/java/org/springframework/xd/module/options/PojoModuleOptionsMetadata.java