diff --git a/journal/branches.md b/journal/branches.md
index 9d8e77450..65f404b87 100644
--- a/journal/branches.md
+++ b/journal/branches.md
@@ -1,7 +1,9 @@
 # branches
 
 - [[trees]] have [[branches]]
+  - and [[leaves]]
   - and a [[root]]
+- [[pull]] [[tree simulator]]
 
 https://twitter.com/flancian/status/1384168593126957076
 https://twitter.com/flancian/status/1384171976629972999
diff --git a/journal/leaves.md b/journal/leaves.md
new file mode 100644
index 000000000..9573f82c7
--- /dev/null
+++ b/journal/leaves.md
@@ -0,0 +1,2 @@
+# leaves
+
diff --git a/leaves.md b/leaves.md
new file mode 100644
index 000000000..fabb365f9
--- /dev/null
+++ b/leaves.md
@@ -0,0 +1,3 @@
+# leaves
+
+- in a [[graph]], a [[node]] with no [[children]].
\ No newline at end of file