diff --git a/src/logging.h b/src/logging.h
index 23d7d24..c6143a7 100644
--- a/src/logging.h
+++ b/src/logging.h
@@ -58,7 +58,7 @@ extern char *log_area_names[];
 /**
  * Activate debug logging.
  * @param log_areas an array of log areas to activate, zero-terminated, should not be empty. The value will by copied
- *      and can be freed after returning from the function.
+ *      and can be freed after returning from the function. Passing NULL will turn off debug logging.
  */
 void activate_debug_logging(int *log_areas);