X-Git-Url: https://git.openstreetmap.org./nominatim.git/blobdiff_plain/984979d9bf448cf8dfab9be763c5e0ba6cf2f399..ab9202b1c2de078822756d447e450610f0815692:/docs/admin/Migration.md

diff --git a/docs/admin/Migration.md b/docs/admin/Migration.md
index 917d3785..b731c37c 100644
--- a/docs/admin/Migration.md
+++ b/docs/admin/Migration.md
@@ -24,6 +24,13 @@ You can then drop the old index with:
 DROP INDEX idx_placex_pendingsector
 ```
 
+### Unused index
+
+This index has been unused ever since the query using it was changed two years ago. Saves about 12GB on a planet installation.
+
+```sql
+DROP INDEX idx_placex_geometry_reverse_lookupPoint
+```
 
 ### Switching to dotenv