diff --git a/gray-card.md b/gray-card.md
new file mode 100644
index 000000000..8777094b7
--- /dev/null
+++ b/gray-card.md
@@ -0,0 +1,10 @@
+# Gray Card
+
+- [[pull]] [[grey card]]
+- [[go]] https://en.wikipedia.org/wiki/Gray_card
+
+
+[//begin]: # "Autogenerated link references for markdown compatibility"
+[pull]: pull "Pull"
+[go]: go "Go"
+[//end]: # "Autogenerated link references"
\ No newline at end of file
diff --git a/journal/2021-01-23.md b/journal/2021-01-23.md
index e9bf17aa6..c5d80b20f 100644
--- a/journal/2021-01-23.md
+++ b/journal/2021-01-23.md
@@ -16,6 +16,9 @@
 - [[choose your own adventure]]
 - [[sandokan]]
 - [[social distributed knowledge graph]]
+- [[18% gray]]
+  - [[gray card]]
+
 
 [//begin]: # "Autogenerated link references for markdown compatibility"
 [agora clients]: ../agora-clients "Agora Clients"