diff --git a/libs/core/_locales/core-strings.json b/libs/core/_locales/core-strings.json
index e10c5bc0..6031242d 100644
--- a/libs/core/_locales/core-strings.json
+++ b/libs/core/_locales/core-strings.json
@@ -73,6 +73,8 @@
   "PinPullMode.PullDown|block": "down",
   "PinPullMode.PullNone|block": "none",
   "PinPullMode.PullUp|block": "up",
+  "PulseValue.High|block": "high",
+  "PulseValue.Low|block": "low",
   "Rotation.Pitch|block": "pitch",
   "Rotation.Roll|block": "roll",
   "String.charAt|block": "char from %this|at %pos",
diff --git a/libs/core/enums.d.ts b/libs/core/enums.d.ts
index 7910c33f..17ec2b2b 100644
--- a/libs/core/enums.d.ts
+++ b/libs/core/enums.d.ts
@@ -275,7 +275,9 @@ declare namespace led {
 
 
     declare enum PulseValue {
+    //% block=high
     High = 4,  // MICROBIT_PIN_EVT_PULSE_HI
+    //% block=low
     Low = 5,  // MICROBIT_PIN_EVT_PULSE_LO
     }
 
diff --git a/libs/core/pins.cpp b/libs/core/pins.cpp
index 74c41332..0d5a46cf 100644
--- a/libs/core/pins.cpp
+++ b/libs/core/pins.cpp
@@ -32,7 +32,9 @@ enum class AnalogPin {
 };
 
 enum class PulseValue {
+    //% block=high
     High = MICROBIT_PIN_EVT_PULSE_HI,
+    //% block=low
     Low = MICROBIT_PIN_EVT_PULSE_LO
 };