diff --git a/docs/learning/04 Testing.ipynb b/docs/learning/04 Testing.ipynb
index 5eaa3ab..ce0c3f2 100644
--- a/docs/learning/04 Testing.ipynb	
+++ b/docs/learning/04 Testing.ipynb	
@@ -116,7 +116,7 @@
    "source": [
     "## Coverage Testing\n",
     "\n",
-    "A useful aspect of testing is *coverage*. This involves looking at how much of your code is actually "covered" by the tests you've written. That is, which individual lines of your code are actually being run by your tests. Tools like `pytest-cov` can measure _coverage_. Unfortunately Numba does not play super well with `pytest-cov`, so we have to turn off Numba using an environment variable so that we can run `pytest-cov` and generate the "test report".\n",
+    "A useful aspect of testing is *coverage*. This involves looking at how much of your code is actually 'covered' by the tests you've written. That is, which individual lines of your code are actually being run by your tests. Tools like `pytest-cov` can measure _coverage_. Unfortunately Numba does not play super well with `pytest-cov`, so we have to turn off Numba using an environment variable so that we can run `pytest-cov` and generate the 'test report'.\n",
     "\n",
     "```bash\n",
     "(recode) tom@TomsLaptop ReCoDE_MCMCFF % pip install pytest-cov # install the coverage testing plugin\n",