Create an .aiexclude file
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By default, Gemini Code Assist code customization indexes all the supported code files in your specified repositories.

In many scenarios, you will have specific files or subtrees that you don't want indexed. For example:

You can exclude these files by creating an .aiexclude file.

How to write an `.aiexclude` file

An .aiexclude file follows the same syntax as a .gitignore file, with the following differences:

An empty .aiexclude file blocks all files in its directory and all sub-directories. This result is the same as a file that contains **/*.
An .aiexclude file doesn't support negation, where you prefix patterns with an exclamation point (!).

The following examples demonstrate how you can configure an .aiexclude file:

Block all files named apikeys.txt at or below the directory that contains the .aiexclude file:
```
apikeys.txt
```
Block all files with the .key file extension at or below the directory that contains the .aiexclude file:
```
*.key
```
Block only the apikeys.txtfile at the same directory as the .aiexclude file, but not any subdirectories:
```
/apikeys.txt
```
Block all files in the directory my/sensitive/dir and all subdirectories. The path should be relative to the directory that contains the .aiexclude file.
```
my/sensitive/dir/
```