diff --git a/src/debug.cpp b/src/debug.cpp
index 5ea7c63a6..c0f5bbecf 100644
--- a/src/debug.cpp
+++ b/src/debug.cpp
@@ -241,6 +241,7 @@ bool parse_log_cfg(const char *conf_str,
                 col() << "][+repeat][+/-timestamps]\n";
                 col() << TBOLD("\trepeat") << " - print repeating log messages\n";
                 col() << TBOLD("\ttimestamps") << " - enable/disable timestamps\n";
+                col() << "environment variable " << SBOLD("ULTRAGRID_VERBOSE") << " - use verbose output (same as `-V` on command-line)\n";
                 return false;
         }
 
diff --git a/src/host.cpp b/src/host.cpp
index c73dad796..65240bc82 100644
--- a/src/host.cpp
+++ b/src/host.cpp
@@ -687,7 +687,10 @@ bool validate_param(const char *param)
  *                 false - set also remaining parameters including full check and "help" output
  *
  * @note
- * This function will be usually called twice - first with preinit=true and then with false
+ * This function will be usually called twice - first with preinit=true and then with false.
+ * It is because the bufffering parameter need to be set early (prior to any output). On the
+ * other hand not all params can be set immediately -- modules are not yet registered, so it
+ * is called once more the preinit is done.
  */
 bool parse_params(const char *optarg, bool preinit)
 {