diff --git a/README.md b/README.md
index 165fda5..ee1bc61 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,14 @@
 Average cumulative mass balance of "reference" Glaciers worldwide from 1945-2014 sourced from [US EPA][datahome] and the [World Glacier Monitoring Service (WGMS)][wgms].
-This is cumulative change in mass balance of a set of "reference" glaciers worldwide beginning in 1945. The values represents the average of all the glaciers that were measured. Negative values indicate a net loss of ice and snow compared with the base year of 1945. For consistency, measurements are in meters of water equivalent, which represent changes in the average thickness of a glacier.
 
-[datahome]: http://www3.epa.gov/climatechange/science/indicators/snow-ice/glaciers.html
-[wgms]: http://wgms.ch/data_databaseversions/
+This is cumulative change in mass balance of a set of "reference" glaciers worldwide beginning in 1945. The values represent the average of all the glaciers that were measured. Negative values indicate a net loss of ice and snow compared with the base year of 1945. For consistency, measurements are in meters of water equivalent, which represent changes in the average thickness of a glacier.
+
+See also: [Glacier mass balance](https://en.wikipedia.org/wiki/Glacier_mass_balance) (Wikipedia)
 
 ## Data
 
+[datahome]: http://www3.epa.gov/climatechange/science/indicators/snow-ice/glaciers.html
+[wgms]: http://wgms.ch/data_databaseversions/
+
 ### Sources
 
 1. 
diff --git a/data/glaciers.csv b/data/glaciers.csv
index 8c7758d..b89e60c 100644
--- a/data/glaciers.csv
+++ b/data/glaciers.csv
@@ -1,5 +1,5 @@
 Year,Mean cumulative mass balance,Number of observations
-1945,0,
+1945,0,1
 1946,-1.13,1
 1947,-3.19,1
 1948,-3.19,1
@@ -68,4 +68,4 @@ Year,Mean cumulative mass balance,Number of observations
 2011,-26.294,37
 2012,-26.93,36
 2013,-27.817,31
-2014,-28.652,24
\ No newline at end of file
+2014,-28.652,24
diff --git a/scripts/process.py b/scripts/process.py
index 8048c65..a9493da 100644
--- a/scripts/process.py
+++ b/scripts/process.py
@@ -23,6 +23,7 @@ def execute():
     records =records[7:]
     for r in records:
         r[2] = r[2].strip()
+        if r[2] is '': r[2] = '1'
     writer = csv.writer(open(data, 'w'), lineterminator='\n')
     writer.writerow(header)
     writer.writerows(records)