diff --git a/README.md b/README.md
index 9d03d6b..98319b6 100644
--- a/README.md
+++ b/README.md
@@ -68,7 +68,7 @@ The physics is coded in C++, with Python as user interface for easy and fast usa
 - CMake 3.4 and newer `apt install cmake`.
 - Eigen 3.3 and newer `apt install libeigen3-dev`.
 - Python 3.8 and newer `apt install libpython3-dev`
-- Doxygen 1.12 and newer 'apt install doxygen'
+- Doxygen 1.12 and newer `apt install doxygen`
   
 ## Build Python package