When I wrote about numbered lists the other day, I mentioned that one item doesn’t make a list so something like the following looks a little silly:

Our product comes in these colours:

1. blue

In this case, you have two real options – incorporate the item into a sentence or use a non-numbered list.

For the above example, sentence form will work much better:

Our product comes in blue.

In other situations, it may be required to use a list format even if there is only one item. A bullet point or em-dash is better than using a numbering system. This may apply, for example, making a point within a list…

Our product has the following specifications:

1. 1m wide
2. made of stainless steel
3. suitable for domestic use
   - 10 year guarantee void in business settings
4. 50kg when constructed