diff --git a/append.md b/append.md
new file mode 100644
index 000000000..2b74735b7
--- /dev/null
+++ b/append.md
@@ -0,0 +1,5 @@
+# append
+
+- an [[operation]]
+  - [[twitter]] https://twitter.com/flancian/status/1437074886573404165
+
diff --git a/journal/2021-09-12.md b/journal/2021-09-12.md
index ff3e868a0..648ace66d 100644
--- a/journal/2021-09-12.md
+++ b/journal/2021-09-12.md
@@ -11,4 +11,5 @@
   - [[wikilinks]]
   - [[tweet]] https://twitter.com/flancian/status/1437079533253976066
   - [[projection]]
-  - [[category]]
\ No newline at end of file
+  - [[category]]
+  - [[append]]
\ No newline at end of file