diff --git a/doc/specification.tex b/doc/specification.tex
index dbc8b5c6fd6c0bb627cbb66eb28fcd2e06959372..8766e4b7509ea64f8fb99cf314b93ecec1c1e89b 100644
--- a/doc/specification.tex
+++ b/doc/specification.tex
@@ -108,7 +108,7 @@ mix homomorphic and non homomorphic questions.
% and slightly less privacy
\medskip
-{\it Group parameters}
+{\it Group parameters.}
The cryptography involved in Belenios needs a cyclic group $\G$ where
discrete logarithms are hard to compute. We will denote by $g$ a
generator and $q$ its order. We use a multiplicative notation for the