diff --git a/src/apsctl/RCU.yaml b/src/apsctl/RCU.yaml
index bcb9625fe2d84f3f2f97745e077e2b11ca60308c..d96227680db9e75c24f32aa4a16a8e51bc83bf89 100644
--- a/src/apsctl/RCU.yaml
+++ b/src/apsctl/RCU.yaml
@@ -333,6 +333,11 @@ variables:
      mask: Ant_mask
 
 methods:
+  - name: RCU_update
+    mask: RCU_mask
+    instructions:
+     - RCU_ADC_lock: Update
+
   - name: RCU_on
     mask: RCU_mask
     instructions: