diff --git a/semester4/dmdb/data-modelling-databases-summary.pdf b/semester4/dmdb/data-modelling-databases-summary.pdf
index ddb3b06..1eea2a2 100644
Binary files a/semester4/dmdb/data-modelling-databases-summary.pdf and b/semester4/dmdb/data-modelling-databases-summary.pdf differ
diff --git a/semester4/dmdb/data-modelling-databases-summary.tex b/semester4/dmdb/data-modelling-databases-summary.tex
index 6f2d574..3577ff4 100644
--- a/semester4/dmdb/data-modelling-databases-summary.tex
+++ b/semester4/dmdb/data-modelling-databases-summary.tex
@@ -62,6 +62,9 @@ This summary assumes some basic knowledge about databases.
 All words written in \textbf{bold} should be clickable and should link you to the corresponding term in the glossary.
 If I did not forget a term that is, of course.
 
+As always with my summaries, this one is provided ``as is'', with no guarantees for correctness.
+If you find an error, don't hesitate to open an \hlhref{https://github.com/janishutz/eth-summaries/issues/new}{issue on the git repo}
+
 \subsection{IMS}
 Early databases were not relational and they also required the user of the system to know \textit{how the data was stored}.
 This of course is not ideal, as any update to the data structure also required an update to the code interacting with it.
diff --git a/semester4/dmdb/parts/00_relational-model_logic/main.tex b/semester4/dmdb/parts/00_relational-model_logic/main.tex
index cd0bb0a..3505450 100644
--- a/semester4/dmdb/parts/00_relational-model_logic/main.tex
+++ b/semester4/dmdb/parts/00_relational-model_logic/main.tex
@@ -1,5 +1,6 @@
 \newsection
 \section{Relational Model, Logic \& Algebra}
+\label{sec:relational-model-logic-algebra}
 \subsection{Relational Model}
 \input{parts/00_relational-model_logic/00_model/00_intro.tex}
 \input{parts/00_relational-model_logic/00_model/01_keys.tex}
diff --git a/semester4/dmdb/parts/08_quick-overview/04_checklist.tex b/semester4/dmdb/parts/08_quick-overview/04_checklist.tex
index 75a2a1d..3576605 100644
--- a/semester4/dmdb/parts/08_quick-overview/04_checklist.tex
+++ b/semester4/dmdb/parts/08_quick-overview/04_checklist.tex
@@ -2,6 +2,7 @@
 The following things are typically important to know very well (not exhaustive)
 \begin{todolist}
     \item SQL (syntax, some concepts, such as using \texttt{WITH} statements often to make the task more approachable), see Section~\ref{sec:sql-basic-ops}
+    \item Relational Algebra notation, see Section~\ref{sec:relational-model-logic-algebra}
     \item Functional Dependencies (including Candidate Keys, Super Keys, Closures and minimal covers), see Section~\ref{sec:functional-dependency}
     \item Normal Forms (and their Decomposition / Synthesis Algorithms), see Section~\ref{sec:normal-forms}
     \item Time complexities, I/Os and sorted runs for Query Processing, see summarized above, or Section~\ref{sec:query-processing}