added clarification on tensorflow version

index.md

@@ -58,6 +58,8 @@ Some packages cannot be installed via `conda` or take too long and need to be in
 pip install yahist
 pip install tensorflow==2.5
 ```
+If `tensorflow==2.5` is not available, `tensorflow==2.11.0` works.
+
 Note: if you are running on `lxplus`, it may also be advisable to specify the installation location in your work or `/eos` area by including the installation path in the above command with `-p /afs/cern.ch/work/...`, as the resulting environment will be several GB in size.
 
 Note: if you are running on `lxplus`, you may run into permissions errors, which may be fixed with: