diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index db2807a..6ccb4e8 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -8,12 +8,14 @@ on:
 
 jobs:
   build:
-
-    runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9, '3.10', '3.11']
-
+        os: [ubuntu-latest]
+        python-version: [3.7, 3.8, 3.9, '3.10', '3.11']
+        include:
+          - os: ubuntu-20.04
+            python-version: 3.6
+    runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}
diff --git a/docstring_to_markdown/rst.py b/docstring_to_markdown/rst.py
index 42e2bc9..174f9de 100644
--- a/docstring_to_markdown/rst.py
+++ b/docstring_to_markdown/rst.py
@@ -339,7 +339,7 @@ def looks_like_rst(value: str) -> bool:
         if (section + '\n' + '-' * len(section) + '\n') in value:
             return True
     for directive in RST_DIRECTIVES:
-        if re.search(directive.pattern, value):
+        if re.search(directive.pattern, value, directive.flags):
             return True
     # allow "text::" or "text ::" but not "^::$" or "^:::$"
     return bool(re.search(r'(\s|\w)::\n', value) or '\n>>> ' in value)
diff --git a/tests/test_rst.py b/tests/test_rst.py
index 5a81949..93f89ac 100644
--- a/tests/test_rst.py
+++ b/tests/test_rst.py
@@ -837,6 +837,7 @@ def test_looks_like_rst_recognises_rst():
     assert looks_like_rst('the following code::\n\n\tcode')
     assert looks_like_rst('See Also\n--------\n')
     assert looks_like_rst('.. versionadded:: 0.1')
+    assert looks_like_rst('Description.\n\n:param spam: eggs.\n')
 
 
 def test_looks_like_rst_ignores_plain_text():