diff --git a/README.md b/README.md
index 74d5a0c..c14f1fa 100644
--- a/README.md
+++ b/README.md
@@ -18,15 +18,7 @@ Currently, I'm considering the following Capturers (based on my own life):
 - [ ] [Mastodon](design/mastodon.md)
 - [ ] [RSS](design/rss.md)
 - [ ] [Guild Wars 2](design/guildwars2.md)
-- [ ] Steam Capturer (?)
-- [ ] Netflix
-- [ ] Deezer
+- [ ] [Steam Capturer](design/steam.md)
+- [ ] [Netflix](design/netflix.md)
+- [ ] [Deezer](design/deezer.md)
 - [ ] Calendar/CalDav
-
-### Steam Capturer
-
-### Netflix Capturer
-
-### Deezer Capturer
-
-### Calendar/CalDav Capturer
diff --git a/design/deezer.md b/design/deezer.md
new file mode 100644
index 0000000..548cf71
--- /dev/null
+++ b/design/deezer.md
@@ -0,0 +1,33 @@
+# Deezer Capturer
+
+Deezer Capturer captures songs played on Deezer.
+
+[Deezer API](https://developers.deezer.com/api) is available. We need to grab
+the user history (`https://api.deezer.com/user/4812817742/history`) from the
+user.
+
+## Configuration
+
+Configuration requires the OAuth token.
+
+## Internals
+
+We need to keep a list of played songs, and compare with the new one.
+
+Need to find the history output, as the API explorer does not show one example.
+
+We could keep:
+
+- `id`: ID or timestamp of the history element. Elements earlier than the most
+  recent one can be ignored.
+- `artist`: Name of the artist.
+- `song`: Name of the song.
+- `album`: Album of the song.
+
+## Output
+
+```
+{% for song in new_songs %}
+Played {{ song.name }} by {{ song.artist }}.
+{% endfor %}
+```
diff --git a/design/guildwars2.md b/design/guildwars2.md
index c8c8b96..d510808 100644
--- a/design/guildwars2.md
+++ b/design/guildwars2.md
@@ -17,3 +17,23 @@ We need to keep, locally:
   and a list of all achievements (there are different calls for each).
 - Current WvW rank, to be compared with the new one.
 - Current PvP rank, to be compared with the new one.
+
+## Output
+
+```
+{% if time_played > 0 %}
+Played Guild Wars 2 for {{ time_played }}.
+
+{% if wvw_rank_increase %}
+Gained {{ wvw_rank_increase }} WvW ranks.
+{% endif %}
+
+{% if pvp_rank_increase %}
+Gained {{ pvp_rank_increase }} PvP ranks.
+{% endif %}
+
+{% for achievements in new_achievements %}
+Completed {{ achievement }}.
+{% endfor %}
+{% endif %}
+```
diff --git a/design/netflix.md b/design/netflix.md
new file mode 100644
index 0000000..a9fc2e1
--- /dev/null
+++ b/design/netflix.md
@@ -0,0 +1,25 @@
+# Netflix Capturer
+
+Steam Capturer captures watched movies and series on Netflix.
+
+There is no API. We need to scrap the user account page to find that out.
+
+## Configuration
+
+Sadly, we may need username and password in the configuration.
+
+## Internals
+
+We need to keep a list of watched content:
+
+- `id` (maybe): ID of the movie/episode.
+- `name`: Name of the movie.
+- `watch_date`: Date the movie/episode was watched.
+
+## Output
+
+```
+{% for content in new_content %}
+Watched {{ content.name }}.
+{% endfor %}
+```
diff --git a/design/steam.md b/design/steam.md
new file mode 100644
index 0000000..ca656a7
--- /dev/null
+++ b/design/steam.md
@@ -0,0 +1,33 @@
+# Steam Capturer
+
+Steam Capturer captures the daily plays on Steam games. Achievements could also
+be captured.
+
+[Steam API documentation](https://steamcommunity.com/dev). We could capture
+"Recently Played Games" and "Get Player Achievements".
+
+## Configuration
+
+The only required configuration is the Steam ID.
+
+## Internals
+
+We need to keep, locally:
+
+- Current list of achievements: We compare this with the new list and find out
+  the new ones.
+- Time in each game "recently played", or some sort of "time played" bootstrap
+  method. We compare this with the Recently Played list to produce a list of
+  Time played.
+
+  ## Output
+
+  ```
+  {% for game in played_games %}
+  Played {{ game.name }} for {{ game.time }}.
+  {% endfor %}
+
+  {% for achievement in new_achievements %}
+  Completed {{ achievement.name }} in {{ achievement.game }}.
+  {% endfor %}
+  ```