diff --git a/source/blender/simulation/intern/ConstrainedConjugateGradient.h b/source/blender/simulation/intern/ConstrainedConjugateGradient.h
index 0dc80c03bb5..11dc3ebe91b 100644
--- a/source/blender/simulation/intern/ConstrainedConjugateGradient.h
+++ b/source/blender/simulation/intern/ConstrainedConjugateGradient.h
@@ -19,6 +19,10 @@
 
 #pragma once
 
+/** \file
+ * \ingroup sim
+ */
+
 #include <Eigen/Core>
 
 namespace Eigen {