diff --git a/doc/TopicMultithreading.dox b/doc/TopicMultithreading.dox
index 47c9b261f..a2855745b 100644
--- a/doc/TopicMultithreading.dox
+++ b/doc/TopicMultithreading.dox
@@ -49,6 +49,7 @@ int main(int argc, char** argv)
 
 In the case your application is parallelized with OpenMP, you might want to disable Eigen's own parallization as detailed in the previous section.
 
+\warning Using OpenMP with custom scalar types that might throw exceptions can lead to unexpected behaviour in the event of throwing.
 */
 
 }