diff --git a/blocksfree/util.py b/blocksfree/util.py
index f105aed..5bb67ca 100644
--- a/blocksfree/util.py
+++ b/blocksfree/util.py
@@ -15,6 +15,12 @@
 # You should have received a copy of the GNU General Public License along
 # with this program; if not, write to the Free Software Foundation, Inc.,
 # 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+"""
+Util functions
+
+This module serves as a catch-all generally for functions that don't seem to
+belong somewhere else.
+"""
 
 from typing import Sequence, Iterator