diff --git a/journal/week9.typ b/journal/week9.typ
new file mode 100644
index 0000000..3178aa1
--- /dev/null
+++ b/journal/week9.typ
@@ -0,0 +1,43 @@
+#import "template.typ": week, day
+
+#show: week.with(num: 9)
+
+#day(1)
+
+- add more docstrings
+- handle column subscript
+- handle `not` operator
+- properly type check parameter default values
+- handle import statements
+- handle column type instantiation
+
+#day(2)
+
+- parse int literals as integers
+- implement scalar ops on frames and columns
+- add more docstrings
+- fix some bugs, make some small improvements
+- complete weather pipeline example with frame operations
+- implement formulae to compute aggregation method return types
+
+#day(3)
+
+- weekly meeting
+- update syntax definitions
+- check variable assignment when referenced
+- add CI to run tests
+- remove complex type
+- complete user manual, including CLI subcommands
+- add variance manager
+- minor improvements
+
+#day(4)
+
+- check, document and fix function subtyping logic
+- add some tests
+- cleanup repository
+
+#day(5)
+
+- remove some raised errors to use diagnostics
+- code repository submission
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