diff --git a/readcrlf.go b/readcrlf.go
new file mode 100644
index 0000000..683418e
--- /dev/null
+++ b/readcrlf.go
@@ -0,0 +1,36 @@
+package eol
+
+import (
+	"io"
+
+	"sourcecode.social/reiver/go-opt"
+)
+
+func ReadCRLF(runescanner io.RuneScanner) (size int, err error) {
+
+	var size0 int
+	{
+		var err error
+
+		const characterNumber uint64 = 1
+		var circumstance internalCircumstance = specifyCircumstance(opt.Something(CRLF), characterNumber)
+		size0, err = readthisrune(circumstance, runescanner, cr)
+		if nil != err {
+			return size0, err
+		}
+	}
+
+	var size1 int
+	{
+		var err error
+
+		const characterNumber uint64 = 2
+		var circumstance internalCircumstance = specifyCircumstance(opt.Something(CRLF), characterNumber)
+		size1, err = readthisrune(circumstance, runescanner, lf)
+		if nil != err {
+			return size1+size0, err
+		}
+	}
+
+	return size1+size0, nil
+}
diff --git a/readcrlf_test.go b/readcrlf_test.go
new file mode 100644
index 0000000..619546a
--- /dev/null
+++ b/readcrlf_test.go
@@ -0,0 +1,215 @@
+package eol_test
+
+import (
+	"testing"
+
+	"io"
+	"strings"
+
+	"sourcecode.social/reiver/go-utf8"
+
+	"sourcecode.social/reiver/go-eol"
+)
+
+func TestReadCRLF(t *testing.T) {
+
+	tests := []struct{
+		Value string
+		ExpectedSize int
+	}{
+		{
+			Value: "\r\n",
+			ExpectedSize: 2,
+		},
+
+
+
+		{
+			Value: "\r\napple banana cherry",
+			ExpectedSize: 2,
+		},
+	}
+
+	for testNumber, test := range tests {
+
+		var reader io.Reader = strings.NewReader(test.Value)
+		var runescanner io.RuneScanner = utf8.NewRuneScanner(reader)
+
+		actualSize, err := eol.ReadCRLF(runescanner)
+		if nil != err {
+			t.Errorf("For test #%d, did not expect an error but actually got one.", testNumber)
+			t.Logf("ERROR: (%T) %s", err, err)
+			t.Logf("VALUE: %q", test.Value)
+			continue
+		}
+
+		{
+			expected := test.ExpectedSize
+			actual   := actualSize
+
+			if expected != actual {
+				t.Errorf("For test #%d, the actual size is not what was expected.", testNumber)
+				t.Logf("EXPECTED: %d", expected)
+				t.Logf("ACTUAL:   %d", actual)
+				t.Logf("VALUE: %q", test.Value)
+				continue
+			}
+		}
+
+	}
+}
+
+func TestReadCRLF_fail(t *testing.T) {
+
+	tests := []struct{
+		Value string
+		ExpectedError string
+		ExpectedSize int
+	}{
+		{
+			Value: "",
+			ExpectedError: `eol: problem reading character №1 of end-of-line sequence "\r\n": EOF`,
+		},
+
+
+
+		{
+			Value: "\n",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found '\n' (U+000A)`,
+		},
+		{
+			Value: "\r",
+			ExpectedError: `eol: problem reading character №2 of end-of-line sequence "\r\n": EOF`,
+			ExpectedSize: 1,
+		},
+		{
+			Value: "\u0085",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found '\u0085' (U+0085)`,
+		},
+		{
+			Value: "\u2028",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found '\u2028' (U+2028)`,
+		},
+
+
+
+		{
+			Value: "😈",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found '😈' (U+1F608)`,
+		},
+
+
+
+		{
+			Value: "\napple banana cherry",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found '\n' (U+000A)`,
+		},
+		{
+			Value: "\u0085apple banana cherry",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found '\u0085' (U+0085)`,
+		},
+		{
+			Value: "\u2028apple banana cherry",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found '\u2028' (U+2028)`,
+		},
+
+
+
+		{
+			Value: "😈apple banana cherry",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found '😈' (U+1F608)`,
+		},
+
+
+
+		{
+			Value: " \n",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found ' ' (U+0020)`,
+		},
+		{
+			Value: " \r",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found ' ' (U+0020)`,
+		},
+		{
+			Value: " \u0085",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found ' ' (U+0020)`,
+		},
+		{
+			Value: " \u2028",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found ' ' (U+0020)`,
+		},
+
+
+
+		{
+			Value: " 😈",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found ' ' (U+0020)`,
+		},
+
+
+
+		{
+			Value: ".\n",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found '.' (U+002E)`,
+		},
+		{
+			Value: ".\r",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found '.' (U+002E)`,
+		},
+		{
+			Value: ".\u0085",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found '.' (U+002E)`,
+		},
+		{
+			Value: ".\u2028",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found '.' (U+002E)`,
+		},
+
+
+
+		{
+			Value: ".😈",
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r\n" character №1 — instead found '.' (U+002E)`,
+		},
+	}
+
+	for testNumber, test := range tests {
+
+		var reader io.Reader = strings.NewReader(test.Value)
+		var runescanner io.RuneScanner = utf8.NewRuneScanner(reader)
+
+		actualSize, err := eol.ReadCRLF(runescanner)
+		if nil == err {
+			t.Errorf("For test #%d, expected an error but did not actually get one.", testNumber)
+			t.Logf("EXPECTED-ERROR: %q", test.ExpectedError)
+			t.Logf("VALUE: %q", test.Value)
+			continue
+		}
+
+		{
+			expected := test.ExpectedError
+			actual   := err.Error()
+
+			if expected != actual {
+				t.Errorf("For test #%d, the actual error is not what was expected.", testNumber)
+				t.Logf("EXPECTED: %q", expected)
+				t.Logf("ACTUAL:   %q", actual)
+				t.Logf("VALUE: %q", test.Value)
+				continue
+			}
+		}
+
+		{
+			expected := test.ExpectedSize
+			actual   := actualSize
+
+			if expected != actual {
+				t.Errorf("For test #%d, the actual size is not what was expected.", testNumber)
+				t.Logf("EXPECTED: %d", expected)
+				t.Logf("ACTUAL:   %d", actual)
+				t.Logf("VALUE: %q", test.Value)
+				continue
+			}
+		}
+	}
+}