diff --git a/day2_software/prs_and_reviewing.ipynb b/day2_software/prs_and_reviewing.ipynb
index ccbf71b..60851d2 100644
--- a/day2_software/prs_and_reviewing.ipynb
+++ b/day2_software/prs_and_reviewing.ipynb
@@ -109,6 +109,8 @@
     "\n",
     "**Bad commit message:** ``Fixed stuff. It's Friday evening and I want to go home now``\n",
     "\n",
+    "If you have a few minutes to spare, [here are some more guidelines for good commit messages (and why they matter)](https://chris.beams.io/posts/git-commit/).\n",
+    "\n",
     "You can now check that your commit is in the history using:\n",
     "\n",
     "    git log\n",
@@ -219,7 +221,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.4"
+   "version": "3.7.1"
   }
  },
  "nbformat": 4,