diff --git a/journal/2021-09-12.md b/journal/2021-09-12.md
index 8c30ddd9c..a25894ce1 100644
--- a/journal/2021-09-12.md
+++ b/journal/2021-09-12.md
@@ -8,4 +8,5 @@
 - [[bolo bolo]]
 - [[push]] [[agora protocol]]
   - [[wikilinks]]
-  - [[tweet]] https://twitter.com/flancian/status/1437079533253976066
\ No newline at end of file
+  - [[tweet]] https://twitter.com/flancian/status/1437079533253976066
+  - [[projection]]
\ No newline at end of file
diff --git a/projection.md b/projection.md
new file mode 100644
index 000000000..9f4b896a6
--- /dev/null
+++ b/projection.md
@@ -0,0 +1,4 @@
+# projection
+
+- a 
+