diff --git a/lambda/display.c b/lambda/display.c
index 26a3db4..079334d 100644
--- a/lambda/display.c
+++ b/lambda/display.c
@@ -66,9 +66,7 @@
 		return;
 	}
 	position++;
-	if (position > MENU_LAST_TEXT ||
-			(position == MENU_LAST_TEXT &&
-			 strlen(lastLine0) == 0 && strlen(lastLine1) == 0)) {
+	if (position > MENU_LAST_TEXT) {
 		position = MENU_OFF;
 	}
 	if (position == MENU_LAST_TEXT) {
diff --git a/lambda/rules.c b/lambda/rules.c
index 03b6956..afb9da7 100644
--- a/lambda/rules.c
+++ b/lambda/rules.c
@@ -50,7 +50,7 @@
 
 /**
  * Reminds to close the air gate when the fire is burning down and the
- * temperature went below 400°C.
+ * temperature went below 400°C (no more flames).
  */
 static void airgateClose(bool* const fired, int8_t const dir,
 		Measurement const meas) {
@@ -78,7 +78,7 @@
 }
 
 /**
- * Notifies that the might have gone out at the beginning of building up.
+ * Notifies that the fire might have gone out at the beginning of building up.
  */
 static void fireOut(bool* const fired, int8_t const dir,
 		Measurement const meas) {
@@ -95,7 +95,7 @@
 /**
  * Array of rules.
  */
-Rule rules[] = {
+static Rule rules[] = {
 		{false, airgate50},
 		{false, airgate25},
 		{false, airgateClose},