diff --git a/docs/storage.md b/docs/storage.md
index de5d038cf..a6ad5e798 100644
--- a/docs/storage.md
+++ b/docs/storage.md
@@ -27,7 +27,7 @@ replayed when the Prometheus server restarts. Write-ahead log files are stored
 in the `wal` directory in 128MB segments. These files contain raw data that
 has not yet been compacted; thus they are significantly larger than regular block
 files. Prometheus will retain a minimum of three write-ahead log files.
-High-traffic servers may retain more than three WAL files in order to to keep at
+High-traffic servers may retain more than three WAL files in order to keep at
 least two hours of raw data.
 
 A Prometheus server's data directory looks something like this: