diff --git a/format.go b/format.go
index 9d59883..3aea01f 100644
--- a/format.go
+++ b/format.go
@@ -23,7 +23,8 @@ import (
 // If format is a different character, Text returns a "%" followed by the
 // unrecognized.Format character. The 'f' format has the possibility of
 // displaying precision that is not present in the Decimal when it appends
-// zeros. All other formats always show the exact precision of the Decimal.
+// zeros (the 'g' format avoids the use of 'f' in this case). All other
+// formats always show the exact precision of the Decimal.
 func (d *Decimal) Text(format byte) string {
 	cap := 10 // TODO(gri) determine a good/better value here
 	return string(d.Append(make([]byte, 0, cap), format))
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..5b03064
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/cockroachdb/apd
+
+require github.com/pkg/errors v0.8.0
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..3dfe462
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+github.com/pkg/errors v0.8.0 h1:WdK/asTD0HN+q6hsWO3/vpuAkAr+tw6aNJNDFFf0+qw=
+github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=