Update migrating-from-the-codeql-runner-to-codeql-cli.md (#23915)

Author: AlonaHlobina

content/code-security/code-scanning/using-codeql-code-scanning-with-your-existing-ci-system/migrating-from-the-codeql-runner-to-codeql-cli.md

@@ -39,6 +39,8 @@ A typical workflow that uses the {% data variables.product.prodname_codeql_cli %
 - `codeql database analyze` to run queries to analyze each {% data variables.product.prodname_codeql %} database and summarize the results in a SARIF file. This command must be run once for each language or database.
 - `codeql github upload-results` to upload the resulting SARIF files to {% data variables.product.prodname_dotcom %}, to be displayed as code scanning alerts. This command must be run once for each language or SARIF file.
 
+The {% data variables.product.prodname_codeql_runner %} is multithreaded by default. The {% data variables.product.prodname_codeql_cli %} only uses a single thread by default, but allows you to specify the amount of threads you want it to use. If you want to replicate the behavior of the {% data variables.product.prodname_codeql_runner %} to use all threads available on the machine when using the {% data variables.product.prodname_codeql_cli %}, you can pass `--threads 0` to `codeql database analyze`.
+
 For more information, see "[Configuring {% data variables.product.prodname_codeql_cli %} in your CI system](/code-security/code-scanning/using-codeql-code-scanning-with-your-existing-ci-system/configuring-codeql-cli-in-your-ci-system)."
 
 ## Examples of common uses for the {% data variables.product.prodname_codeql_cli %}