diff --git a/journal/diary.md b/journal/diary.md
index b639e33fd11fec8561008b1475e9bee9acfec0fc..ec5217a05d5ace773becbf3233810b1384d9082f 100644
--- a/journal/diary.md
+++ b/journal/diary.md
@@ -20,5 +20,7 @@ Uncertain about all the documentation for Jupyter, Python, IPython. It is a lot.
 Since 09apr2020 did only some reading on Python. 
 Removed old versions of Python and installed Python 3.8.2 on Windows with pandas, numpy and PyScripter.  
 Also created an 'addressbook'  sqlite database with the R package `rsqlite` that also should be available with Python code.  
-Today restarted the course with checking what material to read concerning the Jupyter track.
-<!-- hoqc_date='17apr2020' hoqc_hours = ? -->
\ No newline at end of file
+Today restarted the course with checking what material to read concerning the Jupyter track.  
+Later that day also installed Jupyter but met with problems first with installing `rpy2` and later with using it.
+Apparently something wrong with non-matching versions of `Jupyter`, `Python` and `rpy2`. See [rpy2 issue](https://github.com/rpy2/rpy2/issues/682) on GitHub.
+<!-- hoqc_date='17apr2020' hoqc_hours = 0 -->
\ No newline at end of file