diff --git a/README.md b/README.md
index 85ab5f8ac..8034690a2 100644
--- a/README.md
+++ b/README.md
@@ -47,6 +47,7 @@ following commands:
 
 
 ### Documentation
+- Doxygen version >1.8.6 required
 - Generate Doxygen documentation from this code
 
         $ cd doc