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diff --git a/mjo-algebra.tex b/mjo-algebra.tex
index d70d9fd..010ab05 100644
--- a/mjo-algebra.tex
+++ b/mjo-algebra.tex
@@ -1,3 +1,7 @@
+%
+% Abstract algebraic structures.
+%
+
 % Needed for \operatorname.
 \usepackage{amsopn}