diff --git a/docs/usage.md b/docs/usage.md
index 95bb0a0..c765c68 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -547,12 +547,13 @@ To build a custom Centrifuge database, a user needs to download taxonomy files,
 In total, you need four components: a tab-separated file mapping sequence IDs to taxonomy IDs (`--conversion-table`), a tab-separated file mapping taxonomy IDs to their parents and rank, up to the root of the tree (`--taxonomy-tree`), a pipe-separated file mapping taxonomy IDs to a name (`--name-table`), and the reference sequences.
 
 An example of custom `seqid2taxid.map`:
+
 ```
- NC_001133.9 4392  
- NC_012920.1 9606  
- NC_001134.8 4392  
+ NC_001133.9 4392
+ NC_012920.1 9606
+ NC_001134.8 4392
  NC_001135.5 4392
- ```
+```
 
 ```bash
 centrifuge-download -o taxonomy taxonomy