docs: expand JIRA integration instructions

.github/workflows/run-tests.yml

@@ -13,7 +13,7 @@ jobs:
   run-tests:
     runs-on: ubuntu-latest
     env:
-      GO_VERSION: "~1.23"
+      GO_VERSION: "~1.25"
       GO111MODULE: "on"
       USE_CODECOV: true
 

README.md

@@ -135,18 +135,35 @@ git co-last # switch from feature/my-feature to main
 ```
 
 ## JIRA Integration
+The `branch:recent` command can be run with the `--jira` flag to refine the ordering of the results using live data from JIRA. When your branch names include a JIRA issue key, branches tied to active issues you've updated recently appear closer to the top.
 
-The `branch:recent` command can be run with the `--jira` flag to slightly modify the ordering of the results based on open issues in JIRA. Assuming your branches contain
-the JIRA issue key in the branch name, the command will rank branches with open issues that have been updated recently slightly higher in the list.
+### Configuration
 
-Tickets with a higher numerical suffix and have been recently updated are ranked slightly higher in the list, 
-while tickets that have not been updated recently are ranked lower.
+1. **Create an API token**
+   - Visit [Atlassian API Tokens](https://id.atlassian.com/manage-profile/security/api-tokens).
+   - Click **Create API token** and copy the generated value.
 
-```bash
-git-ninja branch:recent --jira
-```
+2. **Configure credentials**
+
+   Create a `.env` file in your project root:
+
+   ```env
+   JIRA_API_TOKEN=your-token
+   JIRA_SUBDOMAIN=acme
+   JIRA_EMAIL_ADDRESS=you@example.com
+   ```
+
+   **Important:** Do not commit `.env` to version control. Add it to `.gitignore` to keep your credentials secure.
+
+3. **Run `branch:recent` with the `--jira` flag**
+
+   ```bash
+   git-ninja branch:recent --jira
+   ```
 
-To enable the JIRA integration, set the `JIRA_API_TOKEN`, `JIRA_SUBDOMAIN` and `JIRA_EMAIL_ADDRESS` environment variables.
+Results are cached for 5 minutes to avoid repeated API calls.
+Recently updated issues rank higher; inactive ones rank lower.
+If cache TTL is configurable, document the flag or env var here.
 
 ## Development Setup