diff --git a/README.md b/README.md
index d552cc8..f2c378f 100644
--- a/README.md
+++ b/README.md
@@ -295,8 +295,16 @@ Replace the date list with whatever range you need.  Each run produces one `*-fi
 # Inspect any moon-related stats for a frame
 python3 moon_detect.py BASE_DIR/east/2026-04-29/21-07-00.jpg --debug /tmp/dbg.png
 python3 moon_phase.py info 2026-04-29T21:07:00Z
+
+# Smoke-test moon ephemeris + sunrise/sunset almanac against the last full moon
+python3 test_last_full_moon.py
 ```
 
+`test_last_full_moon.py` finds the most recent full moon, prints illumination, phase angle,
+altitude/azimuth, and parallactic angle, then lists the sunrise and sunset for that day.
+It exercises the full skyfield stack including the `sun_events_in_range()` almanac call —
+useful after updating skyfield or changing observer config.
+
 **Posting schedule**:
 
 | Job | When the timer fires | When the artifact actually appears |