diff --git a/kraken/blla.py b/kraken/blla.py
index 9c9054af4..d04682ef1 100644
--- a/kraken/blla.py
+++ b/kraken/blla.py
@@ -286,7 +286,7 @@ def segment(im: PIL.Image.Image,
            :force:
 
            'lines': [
-              {'baseline': [[x0, y0], [x1, y1], ..., [x_n, y_n]], 'boundary': [[x0, y0, x1, y1], ... [x_m, y_m]]},
+              {'baseline': [[x0, y0], [x1, y1], ..., [x_n, y_n]], 'boundary': [[x0, y0], [x1, y1], ... [x_m, y_m]]},
               {'baseline': [[x0, ...]], 'boundary': [[x0, ...]]}
             ]
             'regions': [
diff --git a/kraken/containers.py b/kraken/containers.py
index d9c5f3880..fdd9fd283 100644
--- a/kraken/containers.py
+++ b/kraken/containers.py
@@ -48,7 +48,7 @@ class ProcessingStep:
 
     Attributes:
         id: Unique identifier
-        category: Category of processing step that has been performat.
+        category: Category of processing step that has been performed.
         description: Natural-language description of the process.
         settings: Dict describing the parameters of the processing step.
     """
diff --git a/kraken/templates/alto b/kraken/templates/alto
index dd560ddf1..9d648b1e9 100644
--- a/kraken/templates/alto
+++ b/kraken/templates/alto
@@ -80,7 +80,7 @@
     </Tags>
     {% if page.line_orders|length() > 0 %}
     <ReadingOrder>
-        {% if len(page.line_orders) == 1 %}
+        {% if page.line_orders | length == 1 %}
         <OrderedGroup ID="ro_0">
            {% for id in page.line_orders[0] %}
            <ElementRef ID="o_{{ loop.index }}" REF="{{ id }}"/>