diff --git a/doc/source/api-reference/qibo.rst b/doc/source/api-reference/qibo.rst
index f14505fef9..cb02847466 100644
--- a/doc/source/api-reference/qibo.rst
+++ b/doc/source/api-reference/qibo.rst
@@ -1951,7 +1951,7 @@ Frame Potential
 .. autofunction:: qibo.quantum_info.frame_potential
 
 
-Quantum Fisher information matrix
+Quantum Fisher Information Matrix
 """""""""""""""""""""""""""""""""
 
 .. autofunction:: qibo.quantum_info.quantum_fisher_information_matrix