diff --git a/tildes/tests/test_markdown.py b/tildes/tests/test_markdown.py
index e11d8b3..c56951b 100644
--- a/tildes/tests/test_markdown.py
+++ b/tildes/tests/test_markdown.py
@@ -36,13 +36,30 @@ def test_basic_markdown_unescaped():
 
 def test_strikethrough():
     """Ensure strikethrough works and doesn't turn into a group link."""
-    markdown = "This ~should not~ should work"
+    markdown = "This ~~should not~~ should work"
     processed = convert_markdown_to_safe_html(markdown)
 
     assert "<del>" in processed
     assert "<a" not in processed
 
 
+def test_no_single_tilde_strikethrough():
+    """Ensure using single tildes for strikethrough doesn't work."""
+    markdown = "This ~will not~ end up as strikethrough."
+    processed = convert_markdown_to_safe_html(markdown)
+
+    assert "<del>" not in processed
+
+
+def test_strikethrough_with_group():
+    """Ensure strikethrough works with a group name in the middle."""
+    markdown = "They ~~spammed ~music heavily~~ posted lots of songs."
+    processed = convert_markdown_to_safe_html(markdown)
+
+    assert processed.count("<del>") == 1
+    assert "<a" in processed
+
+
 def test_table():
     """Ensure table markdown works."""
     markdown = (
@@ -377,7 +394,7 @@ def test_username_ref_inside_pre_ignored():
 
 def test_group_ref_inside_code_ignored():
     """Ensure a group reference inside a <code> tag doesn't get linked."""
-    markdown = "Strikethrough works like: `this ~should not~ work`."
+    markdown = "Link to a group by just writing its name: `see ~news for more`."
     processed = convert_markdown_to_safe_html(markdown)
 
     assert "<a" not in processed
diff --git a/tildes/tildes/lib/cmark.py b/tildes/tildes/lib/cmark.py
index f6feaa6..fbe5cf7 100644
--- a/tildes/tildes/lib/cmark.py
+++ b/tildes/tildes/lib/cmark.py
@@ -7,11 +7,14 @@ from ctypes import c_char_p, c_int, c_size_t, c_void_p, CDLL
 CMARK_DLL = CDLL("/usr/local/lib/libcmark-gfm.so")
 CMARK_EXT_DLL = CDLL("/usr/local/lib/libcmark-gfm-extensions.so")
 
-# Enable the --hardbreaks and --unsafe options for cmark
-# Can we import these somehow? They're defined in cmark.h as:
-# CMARK_OPT_HARDBREAKS (1 << 2)
-# CMARK_OPT_UNSAFE (1 << 17)
-CMARK_OPTS = (1 << 2) | (1 << 17)
+# Enable cmark options: --hardbreaks, --unsafe, --strikethrough-double-tilde
+# Can we import these somehow? They're defined in cmark.h with the same values as below
+CMARK_OPT_HARDBREAKS = 1 << 2
+CMARK_OPT_UNSAFE = 1 << 17
+CMARK_OPT_STRIKETHROUGH_DOUBLE_TILDE = 1 << 14
+CMARK_OPTS = (
+    CMARK_OPT_HARDBREAKS | CMARK_OPT_UNSAFE | CMARK_OPT_STRIKETHROUGH_DOUBLE_TILDE
+)
 
 CMARK_EXTENSIONS = (b"autolink", b"strikethrough", b"table")