A page a day sounds manageable until about 12 January. A line a day tends to survive. If you have started a journal with good intentions and abandoned it by February, a one-line-a-day notebook may be the format that finally sticks. Each entry takes under a minute, and a year of small, specific details — the first crocuses, a wobbly tooth, the smell of the Christmas tree — adds up to something far richer than you would expect.

Why one line is enough

A blank page asks too much of you at ten o'clock at night. A single line asks almost nothing, and it removes the temptation to perform. With twenty words to play with, you write what actually happened rather than what sounds impressive.

Detail is what makes these notebooks worth keeping. "Rained all day" is forgettable. "Walked to the school gate under the big black umbrella and we were both soaked anyway" brings back the whole morning. One plain line does more work than a page of reflection.

How to set up your journal

Any notebook works, but a few small choices make the habit easier:

• Choose a dated diary with a page per day, or a plain lined notebook where you write the date yourself. A dated diary shows you the gaps; a blank one lets you restart without guilt.
• Keep it small enough to carry and cheap enough to write in badly. Pocket-sized or slim A5 is ideal.
• Decide on one home for it: the kitchen table, a bedside drawer, the glovebox. Somewhere you already sit down each evening.
• Write the date in the margin before bed, not in the morning, so the entry matches the day it describes.
• Pick a pen you like and clip it to the cover. Hunting for a biro is enough friction to make you skip a night.

If a whole line still feels like too much, lower the bar to five words. Five words a day for a year is over 1,800 words about your life — more than most people write in a decade.

Making the habit stick

Pair the line with something you already do: the last cup of tea, brushing your teeth, plugging the phone in to charge. Then you are no longer relying on remembering.

• If you miss a night, leave it blank rather than backfilling. The gaps are part of the record.
• Write in the past tense about the day that has just ended. It reads more naturally than a resolution.
• Do not edit. This is not a draft of anything.
• Once a month, read back over the last few weeks. That is the reward, and it is what keeps you going.
• If you have children, a second notebook for them works well — one line each, each night, takes two minutes.

Spring and summer prompts

Spring

Spring in Britain arrives in fits and starts, which makes it good material.

• The first daffodil I spotted was...
• Weather that surprised me today:
• Something in the garden that has changed this week:
• What we did for Pancake Day, Mothering Sunday or Easter:
• The first evening it was light enough to...
• A sound I associate with spring — lawnmowers, birdsong, rain on the shed roof:

Summer

• The best thing we ate outside:
• Longest day of the year — where I was at 10pm:
• A day out that was worth the traffic:
• Sea, river or paddling pool? Today's water was...
• Something a child said that I want to remember word for word:
• Rain stopped play, so instead we...

Autumn and winter prompts

Autumn

• First day I needed a proper coat:
• Blackberrying, conkers, or leaves in the gutter:
• Something I noticed on the walk to school or work:
• What we are cooking, freezing or harvesting this week:
• Fireworks night — the noise, the sparklers, the soup afterwards:
• The colour of the tree outside our window today:

Winter

• Putting the tree up — who did what:
• The first frost on the windscreen:
• Something small that felt festive:
• Christmas Eve: the last thing we did before bed:
• Boxing Day, in one honest sentence:
• A grey, drizzly January day that was still worth recording because...

Notice that several of these are about weather and small chores. That is deliberate. The ordinary is what fades fastest, and the prompts give you somewhere to start when a big day would only produce a bland line.

Prompts for ordinary family life

Most days will not be seasonal or special, and that is exactly when a prompt earns its keep. Keep a short list at the back of the notebook for evenings when nothing comes to mind.

• Today's small victory:
• Something that made me laugh:
• What we had for tea, and who cooked it:
• A conversation I do not want to forget:
• The state of the kitchen at 8pm:
• One thing I noticed that I would normally walk past:
• What I am looking forward to tomorrow:

A line about the state of the kitchen will not read as mundane in ten years. It will read as evidence.

Start tonight

You do not need a special notebook, a new pen or a fresh month. Write today's date, then one sentence about today. That is the whole method.

Decide now where the notebook will live, and set a reminder on your phone for the same time each evening for the first fortnight. After that, the routine usually carries itself. Keep your seasonal prompts somewhere you can find them, and resist the urge to write well. Write plainly, write briefly, and let a year of small lines do the rest.

Come next December you will have a record no photo album can match: the weather, the half-term squabbles, the first daffodil, the last slice of Christmas cake.

Photo: Nathi Ngwenya / Pexels