diff --git a/journal/2020-12-30.md b/journal/2020-12-30.md
index ab9ca25e0..0665bdd11 100644
--- a/journal/2020-12-30.md
+++ b/journal/2020-12-30.md
@@ -2,4 +2,5 @@
 
 - [[web annotations]]
 - [[wiki]]
+- [[agora]]
 - [[other agoras]]
diff --git a/open-source.md b/open-source.md
index 4dd90ac15..60958d0e2 100644
--- a/open-source.md
+++ b/open-source.md
@@ -1,14 +1,19 @@
 # Open Source
 
 - [[go]] github.com/flancian
-- The [[Agora]] is open source.
-- [[Flancia]] is open source.
-- I embrace [[open ethics]].
+- The [[Agora]] is open source ([[Apache license]]).
+  - [[agora server]]: https://github.com/flancian/agora-server
+  - [[root]]: https://github.com/flancian/agora
+- [[Flancia]] is open source ([[creative-commons-attribution-sharealike-4-0-international]]).
+  - [[flancia.org]]: https://github.com/flancian/flancia
+- I also practice [[open ethics]].
 
 
 [//begin]: # "Autogenerated link references for markdown compatibility"
 [go]: go "Go"
-[agora]: agora "Agora"
-[flancia]: flancia "Flancia"
-[open-ethics]: open-ethics "Open Ethics"
+[Agora]: agora "Agora"
+[agora server]: agora-server "Agora Server"
+[Flancia]: flancia "Flancia"
+[creative-commons-attribution-sharealike-4-0-international]: creative-commons-attribution-sharealike-4-0-international "Creative Commons Attribution Sharealike 4.0 International"
+[open ethics]: open-ethics "Open Ethics"
 [//end]: # "Autogenerated link references"
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