extend comment about C++17 support

diff --git a/doc/external-libs/cuda.html b/doc/external-libs/cuda.html
index 0cc6ca9f98aee47600e9feb62476581ee10ed62d..854169daeeaaa7117fd56abfac1ca915e9678cb5 100644 (file)
--- a/doc/external-libs/cuda.html
+++ b/doc/external-libs/cuda.html
@@ -32,7 +32,8 @@
 
         -DDEAL_II_WITH_CUDA=ON
       </pre>
-      CUDA versions prior to 11.0 don't support C++17 or higher.
+      CUDA versions prior to 11.0 don't support C++17 or higher. You will have
+      to make sure that C++17 is disabled when using earlier versions.
     </p>
 
     <p>