diff --git a/.idea/workspace.xml b/.idea/workspace.xml
new file mode 100644
index 0000000..bad1504
--- /dev/null
+++ b/.idea/workspace.xml
@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ChangeListManager">
+    <list default="true" id="68bdb183-5bdf-4b42-962e-28e58c31a89d" name="Default Changelist" comment="">
+      <change beforePath="$PROJECT_DIR$/.idea/misc.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/misc.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/ptulsconv.iml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/ptulsconv.iml" afterDir="false" />
+    </list>
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+  </component>
+  <component name="GitSEFilterConfiguration">
+    <file-type-list>
+      <filtered-out-file-type name="LOCAL_BRANCH" />
+      <filtered-out-file-type name="REMOTE_BRANCH" />
+      <filtered-out-file-type name="TAG" />
+      <filtered-out-file-type name="COMMIT_BY_MESSAGE" />
+    </file-type-list>
+  </component>
+  <component name="ProjectId" id="1yyIGrXKNUCYtI4PSaCWGoLG76R" />
+  <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
+  <component name="ProjectViewState">
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showLibraryContents" value="true" />
+    <option name="showMembers" value="true" />
+  </component>
+  <component name="PropertiesComponent">
+    <property name="RunOnceActivity.OpenProjectViewOnStart" value="true" />
+    <property name="RunOnceActivity.ShowReadmeOnStart" value="true" />
+  </component>
+  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="project-level" UseSingleDictionary="true" transferred="true" />
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="68bdb183-5bdf-4b42-962e-28e58c31a89d" name="Default Changelist" comment="" />
+      <created>1633217312285</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1633217312285</updated>
+    </task>
+    <task id="LOCAL-00001" summary="Reorganized README a little">
+      <created>1633221191797</created>
+      <option name="number" value="00001" />
+      <option name="presentableId" value="LOCAL-00001" />
+      <option name="project" value="LOCAL" />
+      <updated>1633221191797</updated>
+    </task>
+    <task id="LOCAL-00002" summary="Manpage 0.8.2 bump">
+      <created>1633221729867</created>
+      <option name="number" value="00002" />
+      <option name="presentableId" value="LOCAL-00002" />
+      <option name="project" value="LOCAL" />
+      <updated>1633221729867</updated>
+    </task>
+    <option name="localTasksCounter" value="3" />
+    <servers />
+  </component>
+  <component name="VcsManagerConfiguration">
+    <MESSAGE value="Reorganized README a little" />
+    <MESSAGE value="Manpage 0.8.2 bump" />
+    <option name="LAST_COMMIT_MESSAGE" value="Manpage 0.8.2 bump" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/ptulsconv/pdf/__init__.py b/ptulsconv/pdf/__init__.py
index 8465f02..cf17a3a 100644
--- a/ptulsconv/pdf/__init__.py
+++ b/ptulsconv/pdf/__init__.py
@@ -104,6 +104,9 @@ def make_doc_template(page_size, filename, document_title,
 
 
 def time_format(mins, zero_str="-"):
+    """
+    Formats a duration `mins` into a string
+    """
     if mins is None:
         return zero_str
     if mins == 0. and zero_str is not None: