diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 672bf5cb70..f81b163bf8 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -13513,7 +13513,7 @@ NULL baz(3 rows)
No
input arrays concatenated into array of one higher dimension
(inputs must all have same dimensionality,
- and cannot be empty or NULL)
+ and cannot be empty or null)
@@ -13537,7 +13537,7 @@ NULL baz(3 rows)
otherwise the same as the argument data type
Yes
- the average (arithmetic mean) of all input values
+ the average (arithmetic mean) of all non-null input values
@@ -13665,7 +13665,7 @@ NULL baz(3 rows)
json
No
- aggregates values as a JSON array
+ aggregates values, including nulls, as a JSON array
@@ -13682,7 +13682,7 @@ NULL baz(3 rows)
jsonb
No
- aggregates values as a JSON array
+ aggregates values, including nulls, as a JSON array
@@ -13699,7 +13699,8 @@ NULL baz(3 rows)
json
No
- aggregates name/value pairs as a JSON object
+ aggregates name/value pairs as a JSON object; values can be
+ null, but not names
@@ -13716,7 +13717,8 @@ NULL baz(3 rows)
jsonb
No
- aggregates name/value pairs as a JSON object
+ aggregates name/value pairs as a JSON object; values can be
+ null, but not names
@@ -13732,7 +13734,7 @@ NULL baz(3 rows)
Yes
maximum value of expression across all input
+ class="parameter">expression across all non-null input
values
@@ -13750,7 +13752,7 @@ NULL baz(3 rows)
Yes
minimum value of expression across all input
+ class="parameter">expression across all non-null input
values
@@ -13772,7 +13774,7 @@ NULL baz(3 rows)
same as argument types
No
- input values concatenated into a string, separated by delimiter
+ non-null input values concatenated into a string, separated by delimiter
@@ -13795,7 +13797,8 @@ NULL baz(3 rows)
argument data type
Yes
- sum of expression across all input values
+ sum of expression
+ across all non-null input values
@@ -13812,7 +13815,8 @@ NULL baz(3 rows)
xml
No
- concatenation of XML values (see also )
+ concatenation of non-null XML values
+ (see also )