diff --git a/augur/merge.py b/augur/merge.py
index 422ddc492..ca2cbcbba 100644
--- a/augur/merge.py
+++ b/augur/merge.py
@@ -3,8 +3,7 @@
 
 Datasets can consist of metadata and/or sequence files.
 
-Metadata
-========
+**Metadata**
 
 Metadata tables must be given unique names to identify them in the output and
 are merged in the order given.
@@ -40,8 +39,7 @@
 you want to use a version different from what's on PATH), set the SQLITE3
 environment variable to path of the desired sqlite3 executable.
 
-Sequences
-=========
+**Sequences**
 
 Sequence files are merged in the order given. Naming files is optional. If
 names are provided, they will be checked against any named metadata for order