diff --git a/bibliography/references.bib b/bibliography/references.bib
index b41d85e..2f44ca0 100644
--- a/bibliography/references.bib
+++ b/bibliography/references.bib
@@ -6,6 +6,12 @@
  urldate = {2024-01-01},
  year = {2008},
 }
+@misc{coanalyticranks,
+    AUTHOR = {Christian Rosendal},
+    URL = {https://homepages.math.uic.edu/~rosendal/WebpagesMathCourses/MATH511-notes/DST%20notes%20-%20CoanalyticRanks05.pdf},
+    TITLE = {MATH511 - 5. Coanalytic Ranks and the Reflection Theorems},
+    YEAR = {2012},
+}
 @MISC{801106,
     TITLE = {Closure of a topological group},
     AUTHOR = {Mariano Suarez-Alvarez},
diff --git a/inputs/lecture_18.tex b/inputs/lecture_18.tex
index 4a21148..3ce94dc 100644
--- a/inputs/lecture_18.tex
+++ b/inputs/lecture_18.tex
@@ -108,7 +108,7 @@ This will follow from the following lemma:
     is continuous.
     Since $T_n$ is compact,
     we have that $\{(x,t) \mapsto tx : t \in T_n\}$
-    is equicontinuous.
+    is equicontinuous.\todo{Sheet 11}
     So there is $\epsilon > 0$ such that
     $d(x_1,x_2) < \epsilon \implies d(tx_1, tx_2) < a -b$
     for all $t \in T_n$.
diff --git a/inputs/tutorial_10.tex b/inputs/tutorial_10.tex
index 1a34b51..48a6202 100644
--- a/inputs/tutorial_10.tex
+++ b/inputs/tutorial_10.tex
@@ -197,5 +197,6 @@ In fact we have shown
 
 \nr 4
 
-\todo{Next time}
+A solution can be found in \cite{coanalyticranks}.
 
+% TODO Copy relevant points