diff --git a/thesis.tex b/thesis.tex
index 72a2348..e796d0e 100644
--- a/thesis.tex
+++ b/thesis.tex
@@ -125,11 +125,30 @@
 
 %% If the year of submission is not the current year, uncomment this line and
 %% specify it here:
-\submityear{2020}
+\submityear{2021}
 
 %% Specify the abstract here.
 \abstract{%
-  An abstract\dots
+  Virtually every programming language is equipped with some control
+  operator which enables the programmer to manipulate the flow of
+  control.
+  %
+  First-class control operators provide an expressive and efficient
+  means for programmers to implement their own control idioms as
+  shareable libraries.
+
+  The first strand develops the core calculus of a programming
+  language with a \emph{structural} notion of effects, as opposed to
+  the dominant \emph{nominal} notion of effects.
+
+  By making critical use of \emph{row polymorphism} to build and track
+  effect signatures.
+
+  The second strand studies foundational implementation techniques for
+  deep, shallow, and parameterised effect handlers.
+
+  In this thesis I develop foundational techniques for programming and
+  implementing effect handlers.
 }
 
 %% Now we start with the actual document.