diff --git a/docs/plotting.md b/docs/plotting.md
index 7d22d78ba..ae964fb16 100644
--- a/docs/plotting.md
+++ b/docs/plotting.md
@@ -43,7 +43,7 @@ python scripts/plot_dataframe.py -p BTC_ETH --timerange=100-200
 ```
 Timerange doesn't work with live data.
 
-To plot trades stored in a database use `-db-url` argument:
+To plot trades stored in a database use `--db-url` argument:
 ```
 python scripts/plot_dataframe.py --db-url tradesv3.dry_run.sqlite -p BTC_ETH
 ```