diff --git a/README.md b/README.md
index 617ce52..01a42d2 100644
--- a/README.md
+++ b/README.md
@@ -70,43 +70,43 @@ Supported export formats:
 
   -   ``gpx``: activity GPX file (XML).
 
-      [GPX](https://en.wikipedia.org/wiki/GPS_Exchange_Format) is an open
+      <sub>[GPX](https://en.wikipedia.org/wiki/GPS_Exchange_Format) is an open
       format, mainly for storing GPS routes/tracks. It does support extensions
       and Garmin appears to annotate the GPS data with, for example, heart-rate
-      and cadence, when available on your device.
+      and cadence, when available on your device.</sub>
 
   -   ``tcx``: an activity TCX file (XML).
       *Note: a ``.tcx`` file may not always be possible to export, for example
       if an activity was uploaded in gpx format. In that case, Garmin won't try
       to synthesize a tcx file.*
 
-      [TCX](https://en.wikipedia.org/wiki/Training_Center_XML) (Training Center
-      XML) is Garmin's own XML format. It is, essentially, an extension of GPX
-      which includes more metrics and divides the GPS track into "laps" as
-      recorded by your device (with "lap summaries" for each metric).
+      <sub>[TCX](https://en.wikipedia.org/wiki/Training_Center_XML) (Training
+      Center XML) is Garmin's own XML format. It is, essentially, an extension
+      of GPX which includes more metrics and divides the GPS track into "laps"
+      as recorded by your device (with "lap summaries" for each metric).</sub>
 
   -   ``fit``: activity FIT file (binary format).
       *Note: a ``.fit`` file may not always be possible to export, for example
       if an activity was entered manually rather than imported from a Garmin device.*
 
-      The [FIT](https://www.thisisant.com/resources/fit/) format is the "raw
-      data type" stored in your Garmin device and should contain all metrics
-      your device is capable of tracking (GPS, heart rate, cadence, etc). It's a
-      binary format, so tools are needed to read its content.
+      <sub>The [FIT](https://www.thisisant.com/resources/fit/) format is the
+      "raw data type" stored in your Garmin device and should contain all
+      metrics your device is capable of tracking (GPS, heart rate, cadence,
+      etc). It's a binary format, so tools are needed to read its content.</sub>
 
   -   ``json_summary``: activity summary file (JSON).
 
-      Provides summary data for an activity. Seems to lack a formal schema and
-      should not be counted on as a stable data format (it may change at any
+      <sub>Provides summary data for an activity. Seems to lack a formal schema
+      and should not be counted on as a stable data format (it may change at any
       time). Only included since it *may* contain additional data that could be
-      useful for developers of analysis tools.
+      useful for developers of analysis tools.</sub>
 
   -   ``json_details``: activity details file (JSON).
 
-      Provides detailed activity data in a JSON format. Seems to lack a formal
-      schema and should not be counted on as a stable data format (it may change
-      at any time). Only included since it *may* contain additional data that
-      could be useful for developers of analysis tools.
+      <sub>Provides detailed activity data in a JSON format. Seems to lack a
+      formal schema and should not be counted on as a stable data format (it may
+      change at any time). Only included since it *may* contain additional data
+      that could be useful for developers of analysis tools.</sub>
 
 All files are written to the same directory (``activities/`` by default).
 Each activity file is prefixed by its upload timestamp and its activity id.