diff --git a/ZMQ-Message-Reference.md b/ZMQ-Message-Reference.md
index 5f0abf6..6e89028 100644
--- a/ZMQ-Message-Reference.md
+++ b/ZMQ-Message-Reference.md
@@ -369,9 +369,11 @@ msg2 = ['modified zonePlate definition',
 
 Parameters describing the function of the oscilloscope view of periodic detector readings. Data is a dictionary with the following fields:
 * "on": Boolean integer stating whether the detector readings will be published.
-* "interval": Float value for the time period (seconds) between detector values being published (min. allowed value is 0.1s).
+* "interval": Float value for the time period (seconds) between detector values being published.
 * "countRate": Boolean integer stating whether the published values are per second (1/True), or raw detector values (0/False)
 
+Note that there is no check on the value of "interval" and small values will result in lots of messages being published. An "interval" value of zero will result in no detector values being published (effective period of infinity).
+
 Example:
 ```
 ['oscilloscopeDefinition', {'countRate': 1, 'interval': 1.0, 'on': 0}]