diff --git a/src/aws/osml/image_processing/__init__.py b/src/aws/osml/image_processing/__init__.py
index fbf7042..c7c4a90 100644
--- a/src/aws/osml/image_processing/__init__.py
+++ b/src/aws/osml/image_processing/__init__.py
@@ -105,14 +105,14 @@
    :width: 400
    :alt: Histogram Stretch Applied to Sample SICD Image
 
-    Example of applying histogram_stretch to a sample SICD image.
+   Example of applying histogram_stretch to a sample SICD image.
 
 
 .. figure:: ../images/SAR-QuarterPowerImage.png
    :width: 400
    :alt: Quarter Power Image Applied to Sample SICD Image
 
-    Example of applying quarter_power_image to a sample SICD image.
+   Example of applying quarter_power_image to a sample SICD image.
 
 
 -------------------------
diff --git a/src/aws/osml/photogrammetry/__init__.py b/src/aws/osml/photogrammetry/__init__.py
index c443c24..481a03d 100644
--- a/src/aws/osml/photogrammetry/__init__.py
+++ b/src/aws/osml/photogrammetry/__init__.py
@@ -20,7 +20,7 @@
    :width: 400
    :alt: Photogrammetry Class Diagram
 
-    Class diagram of the aws.osml.photogrammetry package showing public and private classes.
+   Class diagram of the aws.osml.photogrammetry package showing public and private classes.
 
 Geolocating Image Pixels: Basic Examples
 ****************************************
@@ -77,9 +77,12 @@
     :caption: Example showing use of an external SRTM DEM to provide elevation data for image center
 
     ds, sensor_model = load_gdal_dataset("./imagery/sample.nitf")
+
+    # This sets up an external elevation model assuming terrain data is named something like:
+    # ./SRTM/dted/w044/s23.dt2.
     elevation_model = DigitalElevationModel(
-        SRTMTileSet(version="1arc_v3"),
-        GDALDigitalElevationModelTileFactory("./local-SRTM-tiles"))
+        GenericDEMTileSet(format_spec="format_spec="dted/%oh%od/%lh%ld.dt2"),
+        GDALDigitalElevationModelTileFactory("./SRTM"))
 
     # Note the order of ImageCoordinate is (x, y) and the resulting geodetic coordinate is
     # (longitude, latitude, elevation) with longitude and latitude in **radians** and elevation in meters.
diff --git a/tox.ini b/tox.ini
index a2d49de..da2e17a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -40,7 +40,7 @@ commands =
 skip_install = true
 conda_env =
 deps = pre-commit
-commands = pre-commit run --all-files --show-diff-on-failure
+commands = pre-commit run --all-files
 
 [testenv:twine]
 conda_env =
@@ -51,7 +51,7 @@ commands =
     twine check dist/*.tar.gz
 
 [testenv:docs]
-conda_env =
+conda_env = {toxinidir}/environment.yml
 changedir = doc
 deps =
     sphinx>=6.2.1