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-rw-r--r--Docs/manual.texi8
1 files changed, 5 insertions, 3 deletions
diff --git a/Docs/manual.texi b/Docs/manual.texi
index 228ee716d68..83999b6daae 100644
--- a/Docs/manual.texi
+++ b/Docs/manual.texi
@@ -40739,9 +40739,11 @@ $rv = $sth->rows;
@findex DBI->@{NULLABLE@}
@findex NULLABLE DBI method
@item NULLABLE
-Returns a reference to an array of boolean values; for each element of
-the array, a value of TRUE indicates that this
-column may contain @code{NULL} values.
+Returns a reference to an array of values that indicate whether columns may
+contain @code{NULL} values.
+The possible values for each array element are 0 or the empty string if the
+column cannot be @code{NULL}, 1 if it can, and 2 if the column's @code{NULL}
+status is unknown.
Example:
@example
$null_possible = $sth->@{NULLABLE@};