diff --git a/rustfst-python/mkdocs.yml b/rustfst-python/mkdocs.yml
index 5138f009e..6e53cea11 100644
--- a/rustfst-python/mkdocs.yml
+++ b/rustfst-python/mkdocs.yml
@@ -36,6 +36,8 @@ nav:
         - rustfst/algorithms/rm_epsilon/index.md
       - reverse:
         - rustfst/algorithms/reverse/index.md
+      - inversion:
+        - rustfst/algorithms/inversion/index.md
       - project:
         - rustfst/algorithms/project/index.md
       - randgen:
@@ -83,7 +85,7 @@ plugins:
           show_signature_annotations: true
           show_submodules: true
     watch:
-    - rustfst-python/rustfst
+    - rustfst
     - docs
 repo_name: rustfst
 repo_url: https://github.com/Garvys/rustfst
diff --git a/rustfst-python/rustfst/algorithms/tr_sort.py b/rustfst-python/rustfst/algorithms/tr_sort.py
index 5958e4e0e..ac595f1f6 100644
--- a/rustfst-python/rustfst/algorithms/tr_sort.py
+++ b/rustfst-python/rustfst/algorithms/tr_sort.py
@@ -9,11 +9,15 @@
 
 
 def tr_sort(fst: VectorFst, ilabel_cmp: bool):
-    """
-    tr_sort(fst)
-    sort fst trs according to their ilabel or olabel
-    :param fst: Fst
-    :param ilabel_cmp: bool
+    """Sort fst trs in place according to their input or output label.
+
+    This is often necessary for composition to work properly.  It
+    corresponds to `ArcSort` in OpenFST.
+
+    Args:
+      fst: FST to be tr-sorted
+      ilabel_cmp: Sort on input labels if `True`, output labels
+                  if `False`.
     """
 
     ret_code = lib.fst_tr_sort(fst.ptr, ctypes.c_bool(ilabel_cmp))