Summary: Minor update to documentation
Also updated year to 2018 in NOTICE file
Closes #222
diff --git a/NOTICE b/NOTICE
index fe0292c..feb18f0 100644
--- a/NOTICE
+++ b/NOTICE
@@ -1,5 +1,5 @@
Apache MADlib
-Copyright 2016-2017 The Apache Software Foundation.
+Copyright 2016-2018 The Apache Software Foundation.
This product includes software developed at
The Apache Software Foundation (http://www.apache.org/).
diff --git a/src/ports/postgres/modules/summary/summary.sql_in b/src/ports/postgres/modules/summary/summary.sql_in
index 1ceaa29..a220da8 100644
--- a/src/ports/postgres/modules/summary/summary.sql_in
+++ b/src/ports/postgres/modules/summary/summary.sql_in
@@ -128,7 +128,10 @@
</tr>
<tr>
<th>zero_values</th>
- <td>Number of zero values in the target column if target is numeric, otherwise NULL.</td>
+ <td>Number of zero values in the target column if target is numeric, otherwise NULL.
+ Note that we are reporting exact equality to 0.0 here, so even if you have a
+ float value that is extremely small (say due to rounding), it will not be
+ reported as a zero value.</td>
</tr>
<tr>
<th>mean</th>
@@ -141,7 +144,8 @@
<tr>
<th>confidence_interval</th>
<td>Confidence interval (95% using z-score) of the mean value for the target column
- if target is numeric, otherwise NULL.</td>
+ if target is numeric, otherwise NULL.
+ Presented as an array of two elements in the form {lower bound, upper bound}.</td>
</tr>
<tr>
<th>min</th>
