diff --git a/birdman/inference.py b/birdman/inference.py
index b33b7d2..a376891 100644
--- a/birdman/inference.py
+++ b/birdman/inference.py
@@ -16,7 +16,36 @@ def fit_to_inference(
     dims: dict,
     posterior_predictive: str = None,
     log_likelihood: str = None,
-):
+) -> az.InferenceData:
+    """Convert a fitted model to an arviz InferenceData object.
+
+    :param fit: Fitted CmdStan model
+    :type fit: Either CmdStanMCMC or CmdStanVB
+
+    :param chains: Number of chains
+    :type chains: int
+
+    :param draws: Number of draws
+    :type draws: int
+
+    :param params: Parameters to include in inference
+    :type params: Sequence[str]
+
+    :param coords: Coordinates for InferenceData
+    :type coords: dict
+
+    :param dims: Dimensions for InferenceData
+    :type dims: dict
+
+    :param posterior_predictive: Name of posterior predictive var in model
+    :type posterior_predictive: str
+
+    :param log_likelihood: Name of log likelihood var in model
+    :type log_likelihood: str
+
+    :returns: Model converted to InferenceData
+    :rtype: az.InferenceData
+    """
     if log_likelihood is not None and log_likelihood not in dims:
         raise KeyError("Must include dimensions for log-likelihood!")
     if posterior_predictive is not None and posterior_predictive not in dims:
@@ -120,15 +149,33 @@ def concatenate_inferences(
     return az.concat(*all_group_inferences)
 
 
-# TODO: Fix docstring
 def stan_var_to_da(
     data: np.ndarray,
     coords: dict,
     dims: dict,
     chains: int,
     draws: int
-):
-    """Convert Stan variable draws to xr.DataArray."""
+) -> xr.DataArray:
+    """Convert results of stan_var to DataArray.
+
+    :params data: Result of stan_var
+    :type data: np.ndarray
+
+    :params coords: Coordinates of variables
+    :type coords: dict
+
+    :params dims: Dimensions of variables
+    :type dims: dict
+
+    :params chains: Number of chains
+    :type chains: int
+
+    :params draws: Number of draws
+    :type draws: int
+
+    :returns: DataArray representation of stan variables
+    :rtype: xr.DataArray
+    """
     data = np.stack(np.split(data, chains))
 
     coords["draw"] = np.arange(draws)
diff --git a/environment.yml b/environment.yml
index 72d8bd7..c4b0e5d 100644
--- a/environment.yml
+++ b/environment.yml
@@ -6,7 +6,7 @@ channels:
 dependencies:
   - pandas
   - numpy
-  - python=3.7
+  - python=3.8
   - python-language-server
   - xarray
   - patsy
@@ -16,4 +16,3 @@ dependencies:
   - docutils==0.16
   - pip:
     - sphinx-rtd-theme==0.5.1
-prefix: /Users/gibs/miniconda3/envs/birdman