diff --git a/readcr.go b/readcr.go
index f3c5907..555bc36 100644
--- a/readcr.go
+++ b/readcr.go
@@ -2,9 +2,12 @@ package eol
 
 import (
 	"io"
+
+	"sourcecode.social/reiver/go-opt"
 )
 
 func ReadCR(runescanner io.RuneScanner) (size int, err error) {
-	const runeNumber = 1
-	return readthisrune(runescanner, cr, runeNumber)
+	const characterNumber uint64 = 1
+	var circumstance internalCircumstance = specifyCircumstance(opt.Something(CR), characterNumber)
+	return readthisrune(circumstance, runescanner, cr)
 }
diff --git a/readcr_test.go b/readcr_test.go
index 61667c7..c45a08b 100644
--- a/readcr_test.go
+++ b/readcr_test.go
@@ -67,103 +67,103 @@ func TestReadCR_fail(t *testing.T) {
 	}{
 		{
 			Value: "",
-			ExpectedError: `eol: problem reading character №1 of end-of-line sequence: EOF`,
+			ExpectedError: `eol: problem reading character №1 of end-of-line sequence "\r": EOF`,
 		},
 
 
 
 		{
 			Value: "\n",
-			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line character №1 — instead found '\n' (U+000A)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" character №1 — instead found '\n' (U+000A)`,
 		},
 		{
 			Value: "\u0085",
-			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line character №1 — instead found '\u0085' (U+0085)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" character №1 — instead found '\u0085' (U+0085)`,
 		},
 		{
 			Value: "\u2028",
-			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line character №1 — instead found '\u2028' (U+2028)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" character №1 — instead found '\u2028' (U+2028)`,
 		},
 
 
 
 		{
 			Value: "😈",
-			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line character №1 — instead found '😈' (U+1F608)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" 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 character №1 — instead found '\n' (U+000A)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" 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 character №1 — instead found '\u0085' (U+0085)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" 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 character №1 — instead found '\u2028' (U+2028)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" 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 character №1 — instead found '😈' (U+1F608)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" character №1 — instead found '😈' (U+1F608)`,
 		},
 
 
 
 		{
 			Value: " \n",
-			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line character №1 — instead found ' ' (U+0020)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" character №1 — instead found ' ' (U+0020)`,
 		},
 		{
 			Value: " \r",
-			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line character №1 — instead found ' ' (U+0020)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" character №1 — instead found ' ' (U+0020)`,
 		},
 		{
 			Value: " \u0085",
-			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line character №1 — instead found ' ' (U+0020)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" character №1 — instead found ' ' (U+0020)`,
 		},
 		{
 			Value: " \u2028",
-			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line character №1 — instead found ' ' (U+0020)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" character №1 — instead found ' ' (U+0020)`,
 		},
 
 
 
 		{
 			Value: " 😈",
-			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line character №1 — instead found ' ' (U+0020)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" character №1 — instead found ' ' (U+0020)`,
 		},
 
 
 
 		{
 			Value: ".\n",
-			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line character №1 — instead found '.' (U+002E)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" character №1 — instead found '.' (U+002E)`,
 		},
 		{
 			Value: ".\r",
-			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line character №1 — instead found '.' (U+002E)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" character №1 — instead found '.' (U+002E)`,
 		},
 		{
 			Value: ".\u0085",
-			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line character №1 — instead found '.' (U+002E)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" character №1 — instead found '.' (U+002E)`,
 		},
 		{
 			Value: ".\u2028",
-			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line character №1 — instead found '.' (U+002E)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" character №1 — instead found '.' (U+002E)`,
 		},
 
 
 
 		{
 			Value: ".😈",
-			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line character №1 — instead found '.' (U+002E)`,
+			ExpectedError: `eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence "\r" character №1 — instead found '.' (U+002E)`,
 		},
 	}