diff --git a/README.md b/README.md
index 7f0ee79..55b4505 100644
--- a/README.md
+++ b/README.md
@@ -750,10 +750,10 @@ The feature assumes that you have mapped `/var/lib/collectd` to a volume (to ens
 ...
 ```
 
-| Environment Variable              | Purpose                                                                                     | Default |
-| --------------------------------- | ------------------------------------------------------------------------------------------- | ------- |
-| `GRAPHS1090_REDUCE_IO=`           | Optional Set to `true` to reduce the write cycles for `graphs1090`                          | Unset   |
-| `GRAPHS1090_REDUCE_IO_FLUSH_IVAL` | Interval (in secs) over which the `graphs1090` data is written back to non-volatile storage | `3600`  |
+| Environment Variable              | Purpose                                                                                        | Default |
+| --------------------------------- | ---------------------------------------------------------------------------------------------- | ------- |
+| `GRAPHS1090_REDUCE_IO=`           | Optional Set to `true` to reduce the write cycles for `graphs1090`                             | Unset   |
+| `GRAPHS1090_REDUCE_IO_FLUSH_IVAL` | Interval (i.e. 1h, 6h, 24h, 1d, 2d) writing `graphs1090` data back to non-volatile storage     | `1d`    |
 
 ### `timelapse1090` Configuration