diff --git a/ZMQ-Message-Reference.md b/ZMQ-Message-Reference.md
index 6e89028..bbcc8e0 100644
--- a/ZMQ-Message-Reference.md
+++ b/ZMQ-Message-Reference.md
@@ -372,7 +372,7 @@ Parameters describing the function of the oscilloscope view of periodic detector
 * "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).
+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 or less (i.e. negative) will result in no detector values being published (effective period of infinity).
 
 Example:
 ```
@@ -382,6 +382,16 @@ Example:
 
 ## 'focusType'
 
+Set the autofocus mode of the zoneplate. Data must be one of the following strings:
+* "Auto": zoneplate will move to keep focal plane in the calculated position whenever the energy is changed.
+* "Static": zoneplate stage will not respond to changes in energy.
+
+Example:
+```
+['focusType', "Auto"]
+```
+
+
 ## 'scanTypeArchive'
 
 ## 'localFileScanTypeArchive'