diff --git a/readlf.go b/readlf.go
index 04cc933..43d2e03 100644
--- a/readlf.go
+++ b/readlf.go
@@ -2,9 +2,12 @@ package eol
 
 import (
 	"io"
+
+	"sourcecode.social/reiver/go-opt"
 )
 
 func ReadLF(runescanner io.RuneScanner) (size int, err error) {
-	const runeNumber = 1
-	return readthisrune(runescanner, lf, runeNumber)
+	const characterNumber uint64 = 1
+	var circumstance internalCircumstance = specifyCircumstance(opt.Something(LF), characterNumber)
+	return readthisrune(circumstance, runescanner, lf)
 }
diff --git a/readlf_test.go b/readlf_test.go
index 5fc4cdb..f021117 100644
--- a/readlf_test.go
+++ b/readlf_test.go
@@ -67,103 +67,103 @@ func TestReadLF_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 "\n": EOF`,
 		},
 
 
 
 		{
 			Value: "\r",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found '\r' (U+000D)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found '\r' (U+000D)`,
 		},
 		{
 			Value: "\u0085",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found '\u0085' (U+0085)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found '\u0085' (U+0085)`,
 		},
 		{
 			Value: "\u2028",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found '\u2028' (U+2028)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found '\u2028' (U+2028)`,
 		},
 
 
 
 		{
 			Value: "😈",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found '😈' (U+1F608)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found '😈' (U+1F608)`,
 		},
 
 
 
 		{
 			Value: "\rapple banana cherry",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found '\r' (U+000D)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found '\r' (U+000D)`,
 		},
 		{
 			Value: "\u0085apple banana cherry",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found '\u0085' (U+0085)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found '\u0085' (U+0085)`,
 		},
 		{
 			Value: "\u2028apple banana cherry",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found '\u2028' (U+2028)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found '\u2028' (U+2028)`,
 		},
 
 
 
 		{
 			Value: "😈apple banana cherry",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found '😈' (U+1F608)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found '😈' (U+1F608)`,
 		},
 
 
 
 		{
 			Value: " \n",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found ' ' (U+0020)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found ' ' (U+0020)`,
 		},
 		{
 			Value: " \r",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found ' ' (U+0020)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found ' ' (U+0020)`,
 		},
 		{
 			Value: " \u0085",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found ' ' (U+0020)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found ' ' (U+0020)`,
 		},
 		{
 			Value: " \u2028",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found ' ' (U+0020)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found ' ' (U+0020)`,
 		},
 
 
 
 		{
 			Value: " 😈",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found ' ' (U+0020)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found ' ' (U+0020)`,
 		},
 
 
 
 		{
 			Value: ".\n",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found '.' (U+002E)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found '.' (U+002E)`,
 		},
 		{
 			Value: ".\r",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found '.' (U+002E)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found '.' (U+002E)`,
 		},
 		{
 			Value: ".\u0085",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found '.' (U+002E)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found '.' (U+002E)`,
 		},
 		{
 			Value: ".\u2028",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found '.' (U+002E)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found '.' (U+002E)`,
 		},
 
 
 
 		{
 			Value: ".😈",
-			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line character №1 — instead found '.' (U+002E)`,
+			ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n" character №1 — instead found '.' (U+002E)`,
 		},
 	}