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diff --git a/mjo-calculus.tex b/mjo-calculus.tex
index fbc9bfe..6021163 100644
--- a/mjo-calculus.tex
+++ b/mjo-calculus.tex
@@ -1,3 +1,6 @@
+%
+% Standard calculus operations.
+%
 \ifx\havemjocalculus\undefined
 \def\havemjocalculus{1}