diff --git a/conf/defaults.ini b/conf/defaults.ini
index 6ebf5fac01d..689a6334b30 100644
--- a/conf/defaults.ini
+++ b/conf/defaults.ini
@@ -3,6 +3,7 @@
 # Do not modify this file in grafana installs
 #
 
+# possible values : production, development
 app_mode = production
 
 #################################### Paths ####################################
diff --git a/conf/sample.ini b/conf/sample.ini
index 9a8d9aa3908..c92656481b1 100644
--- a/conf/sample.ini
+++ b/conf/sample.ini
@@ -3,6 +3,7 @@
 # Everything has defaults so you only need to uncomment things you want to
 # change
 
+# possible values : production, development    
 ; app_mode = production
 
 #################################### Paths ####################################