Update docstring

payu/models/cable.py

@@ -22,7 +22,35 @@
 
 
 def _get_forcing_path(variable, year, input_dir, offset=None, repeat=None):
-    """Return the met forcing file path for a given variable and year."""
+    """Return the met forcing file path for a given variable and year.
+    
+    Parameters
+    ----------
+    variable : str
+        Variable name.
+    year : int
+        Year value.
+    input_dir : str
+        Path to work input directory.
+    offset : list of int, optional
+        Offset the current simulation year from `offset[0]` to `offset[1]`
+        before inferring the met forcing path.
+    repeat : list of int, optional
+        Constrain the current simulation year between `repeat[0]` and
+        `repeat[1]` (inclusive) before inferring the met forcing path. If the
+        year is outside the interval, the constrained year repeats over the
+        interval.
+
+    Returns
+    -------
+    path : str
+        Path (relative to control directory) to the inferred met forcing file.
+
+    Raises
+    ------
+    FileNotFoundError
+        If unable to infer met forcing path.
+    """
     if offset:
         year += offset[1] - offset[0]
     if repeat: