diff git a/index.Rmd b/index.Rmd
index d8e3592..a37cdaf 100644
 a/index.Rmd
+++ b/index.Rmd
@@ 451,12 +451,12 @@ kable(data.frame(`Shanon index`=H),
As :
$$
H(X) = \logA \;\Rightarrow\; ^2D = e^{H(X)}
+H(X) = \logA \;\Rightarrow\; ^1D = e^{H(X)}
$$
where $^2D$ is the theoretical number of species in a evenly distributed community that would have the same Shanon's entropy than ours.
+where $^1D$ is the theoretical number of species in a evenly distributed community that would have the same Shanon's entropy than ours.
diff git a/index.html b/index.html
index 878aff9..5a22cb7 100644
 a/index.html
+++ b/index.html
@@ 1751,11 +1751,11 @@ Environment.2
As : \[
H(X) = \logA \;\Rightarrow\; ^2D = e^{H(X)}
+H(X) = \logA \;\Rightarrow\; ^1D = e^{H(X)}
\]

where \(^2D\) is the theoretical number of species in a evenly distributed community that would have the same Shanon's entropy than ours.
+where \(^1D\) is the theoretical number of species in a evenly distributed community that would have the same Shanon's entropy than ours.