diff --git a/aosstower/level_b1/nc.py b/aosstower/level_b1/nc.py
index 91e75227d4ab4fcb1bf1ce85ca4fc308b391aba2..645feff5abf11fa6fe37a4b4cb529f057a8014a2 100644
--- a/aosstower/level_b1/nc.py
+++ b/aosstower/level_b1/nc.py
@@ -23,7 +23,6 @@ def writeDimensions(ncFile):
     return ncFile
 
 def createVariables(ncFile, firstStamp, chunksizes, zlib):
- 
     #base_time long name
     btln = 'base time as unix timestamp'
 
@@ -106,7 +105,7 @@ def createVariables(ncFile, firstStamp, chunksizes, zlib):
 
     #create global attributes
     ncFile.source = 'surface observation'
-    ncFile.conventions = 'CF-1.6'
+    ncFile.conventions = 'ARM-1.2 CF-1.6'
     ncFile.institution = 'UW SSEC'
     ncFile.featureType = 'timeSeries'
     ncFile.data_level = 'a0'