# Header and Footer The **Table Header** and **Table Footer** are bookend components that provide context for the data presented in your table. The header introduces the table with a title and optional subtitle, while the footer anchors it with source notes or other supplementary information. Both are added using the `tab_*()` family of methods. # Adding a Table Header The way that we add components like the **Table Header** and *source notes* in the **Table Footer** is to use the `tab_*()` family of methods. A **Table Header** is easy to add so let's see how the previous table looks with a *title* and a *subtitle*. We can add this component using the [tab_header()](../reference/GT.tab_header.md#great_tables.GT.tab_header) method: ``` python from great_tables import GT, md, html from great_tables.data import islands islands_mini = islands.head(10) # Make a display table with the `islands_tbl` table; # put a heading just above the column labels ( GT(islands_mini) .tab_header( title = "Large Landmasses of the World", subtitle = "The top ten largest are presented" ) ) ```

Large Landmasses of the World
The top ten largest are presented
name	size
Africa	11506
Antarctica	5500
Asia	16988
Australia	2968
Axel Heiberg	16
Baffin	184
Banks	23
Borneo	280
Britain	84
Celebes	73

The **Header** table component provides an opportunity to describe the data that's presented. Using `subtitle=` allows us to insert a subtitle, which is an optional part of the **Header**. We may also style the `title=` and `subtitle=` using Markdown! We do this by wrapping the values passed to `title=` or `subtitle=` with the [md()](../reference/md.md#great_tables.md) helper function (we may also use [html()](../reference/html.md#great_tables.html) in a similar fashion). Here is an example with the table data truncated for brevity: ``` python # Make a display table with the `islands_tbl` table; # put a heading just above the column labels gt_tbl = ( GT(islands.head(2)) .tab_header( title = md("Large Landmasses of the *World* 🌐"), subtitle = md("The top **ten** largest are presented") ) ) gt_tbl ```

Large Landmasses of the World 🌐
The top ten largest are presented
name	size
Africa	11506
Antarctica	5500

A *source note* can be added to the table's **Footer** through use of the [tab_source_note()](../reference/GT.tab_source_note.md#great_tables.GT.tab_source_note) method. It works in the same way as [tab_header()](../reference/GT.tab_header.md#great_tables.GT.tab_header) (it also allows for Markdown inputs) except it can be called multiple times--each invocation results in the addition of a source note. # Adding Source Notes ``` python # Display the `islands_tbl` data with a heading and two source notes ( gt_tbl .tab_source_note( source_note = "Source: The World Almanac and Book of Facts, 1975, page 406." ) .tab_source_note( source_note = md("Reference: McNeil, D. R. (1977) *Interactive Data Analysis*. Wiley.") ) ) ```

Large Landmasses of the World 🌐
The top ten largest are presented
name	size
Africa	11506
Antarctica	5500
Source: The World Almanac and Book of Facts, 1975, page 406.
Reference: McNeil, D. R. (1977) Interactive Data Analysis. Wiley.

With just a few method calls, we have added essential context to the table. The title and subtitle tell the reader what data is being presented, and the source notes provide attribution. Together, these components frame the table body and help your audience understand the data at a glance.