diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index d99dbf7..f08f9a0 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -10,6 +10,7 @@
 * Update for ldap3 2.x.
 * Rename project to ldap-passwd-webui.
 * Use `logging` module for logging instead of `print()`.
+* Allow to enable bottle debug mode by setting environment variable `DEBUG`.
 
 
 == link:{tags}/v1.0.0[1.0.0] (2017-06-06)
diff --git a/app.py b/app.py
index 8901d7d..dbdb4bd 100755
--- a/app.py
+++ b/app.py
@@ -10,7 +10,7 @@
     LDAPInvalidCredentialsResult, LDAPUserNameIsMandatoryError
 import logging
 import os
-from os import path
+from os import environ, path
 
 
 BASE_DIR = path.dirname(__file__)
@@ -119,6 +119,9 @@
     pass
 
 
+if environ.get('DEBUG'):
+    bottle.debug(True)
+
 # Set up logging.
 logging.basicConfig(format=LOG_FORMAT)
 LOG.setLevel(logging.INFO)