diff --git a/actions/__init__.py b/actions/__init__.py
index 8eac7d9..4d208ea 100644
--- a/actions/__init__.py
+++ b/actions/__init__.py
@@ -28,4 +28,4 @@
 #     ├── test_summarize_pr.py
 #     └── ...
 
-__version__ = "0.2.19"
+__version__ = "0.2.20"
diff --git a/actions/format_python_docstrings.py b/actions/format_python_docstrings.py
index 0568a51..96f8071 100644
--- a/actions/format_python_docstrings.py
+++ b/actions/format_python_docstrings.py
@@ -380,7 +380,8 @@ def format_docstring(
     single_ok = ("\n" not in text) and not has_section and not has_list
     if single_ok:
         words = text.split()
-        if words and not words[0].startswith(("http://", "https://")) and not words[0][0].isupper():
+        core = words[0].rstrip(".") if words else ""  # ignore terminal dots so only interior ones mark identifiers
+        if core.islower() and not any(c in core for c in "_./`("):
             words[0] = words[0][0].upper() + words[0][1:]
         out = " ".join(words)
         if out and out[-1] not in ".!?":
diff --git a/tests/test_cli_commands.py b/tests/test_cli_commands.py
index 529f1c4..b7478e8 100644
--- a/tests/test_cli_commands.py
+++ b/tests/test_cli_commands.py
@@ -26,3 +26,15 @@ def test_docstring_formatter_keeps_simple_docstrings_single_line():
     text = "Make the live fp32 EMA genuinely non-finite while the model stays finite (sticky-NaN on a finite-loss run)."
 
     assert format_python_docstrings.format_docstring(text, 8, 120, '"""', "") == f'"""{text}"""'
+
+
+def test_docstring_formatter_preserves_identifier_first_words():
+    """Test that code identifiers, dotted names, and URLs are not capitalized as first words."""
+    for text in (
+        "process_mask/process_mask_native/scale_masks must handle 0 detections without crashing.",
+        "np.array inputs are converted to tensors.",
+        "https://ultralytics.com hosts the docs.",
+        "iOS builds are not supported.",
+    ):
+        assert format_python_docstrings.format_docstring(text, 8, 120, '"""', "") == f'"""{text}"""'
+    assert format_python_docstrings.format_docstring("done.", 8, 120, '"""', "") == '"""Done."""'