diff --git a/README.md b/README.md
index 02046cc..9313d29 100644
--- a/README.md
+++ b/README.md
@@ -40,6 +40,7 @@ You may also want to supply any of the following variables to override default b
 - `HOST_NAME` - (*default:* `localhost`) used as Apache `ServerName`
 - `ADMIN_EMAIL` - (*default:* `admin@davical.example.com`) [email displayed on login page and in "From" for password reset emails](https://wiki.davical.org/index.php?title=Configuration/settings/admin_email)
 - `TZ` - (*default:* `UTC`) system [timezone name](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones)
+- `DAVICAL_DEBUG_ALL` - (*default: none*) set to "true" to enable debug logs for all events
 
 #### DB Creation/Migrations
 
diff --git a/config/config.php b/config/config.php
index 72a1d0b..3c45d20 100644
--- a/config/config.php
+++ b/config/config.php
@@ -164,7 +164,9 @@
 * There are many different types of debug messages (for more details see
 * debug-config.php), but this will log them all:
 */
-// $c->dbg["ALL"] = 1;
+if (getenv("DAVICAL_DEBUG_ALL") == "true") {
+  $c->dbg["ALL"] = 1;
+}
 
 /**
 * While the above setting will quickly fill your PHP error log and should best