diff --git a/periods.json b/periods.json
index 50d0347..07562eb 100644
--- a/periods.json
+++ b/periods.json
@@ -1,7 +1,7 @@
 [
     {
         "name" : "offpeak-morning",
-        "verbose-name" : "Morning off-peak",
+        "verbose-name" : "Morning off-peak (until 08:00)",
         "timestart" : "00:00",
         "states" : [
             { "duration" : 20, "north" : "green", "south" : "green", "east" :   "red", "west" :   "red", "north-right" :   "red" },
@@ -17,7 +17,7 @@
     },
     {
         "name" : "peak-morning",
-        "verbose-name" : "Morning peak",
+        "verbose-name" : "Morning peak (08:00 to 10:00)",
         "timestart" : "08:00",
         "states" : [
             { "duration" : 40, "north" : "green", "south" : "green", "east" :   "red", "west" :   "red", "north-right" :   "red" },
@@ -33,7 +33,7 @@
     },
     {
         "name" : "offpeak-middle",
-        "verbose-name" : "Middle off-peak",
+        "verbose-name" : "Middle off-peak (10:00 to 17:00)",
         "timestart" : "10:00",
         "states" : [
             { "duration" : 20, "north" : "green", "south" : "green", "east" :   "red", "west" :   "red", "north-right" :   "red" },
@@ -49,7 +49,7 @@
     },
     {
         "name" : "peak-afternoon",
-        "verbose-name" : "Afternoon peak",
+        "verbose-name" : "Afternoon peak (17:00 to 19:00)",
         "timestart" : "17:00",
         "states" : [
             { "duration" : 40, "north" : "green", "south" : "green", "east" :   "red", "west" :   "red", "north-right" :   "red" },
@@ -65,7 +65,7 @@
     },
     {
         "name" : "offpeak-evening",
-        "verbose-name" : "Evening off-peak",
+        "verbose-name" : "Evening off-peak (after 19:00)",
         "timestart" : "19:00",
         "states" : [
             { "duration" : 20, "north" : "green", "south" : "green", "east" :   "red", "west" :   "red", "north-right" :   "red" },