diff --git a/internal/core/file.go b/internal/core/file.go
index 2e426405..3e8203a3 100755
--- a/internal/core/file.go
+++ b/internal/core/file.go
@@ -202,7 +202,13 @@ func (f *File) FindLoc(ctx, s string, pad, count int, a Alert) (int, []int) {
 func (f *File) assignLoc(ctx string, blk nlp.Block, pad int, a Alert) (int, []int) {
 	loc := a.Span
 	for idx, l := range strings.SplitAfter(ctx, "\n") {
-		if idx == blk.Line {
+		// NOTE: This fixes #473, but the real issue is that `blk.Line` is
+		// wrong. This seems related to `location.go#41`, but I'm not sure.
+		//
+		// At the very least, this change includes a representative test case
+		// and a temporary fix.
+		exact := len(l) > loc[1] && l[loc[0]:loc[1]] == a.Match
+		if exact || idx == blk.Line {
 			length := utf8.RuneCountInString(l)
 			pos, substring := initialPosition(l, blk.Text, a)
 
@@ -216,7 +222,7 @@ func (f *File) assignLoc(ctx string, blk nlp.Block, pad int, a Alert) (int, []in
 				loc[1] = 1
 			}
 
-			return blk.Line + 1, loc
+			return idx + 1, loc
 		}
 	}
 	return blk.Line + 1, a.Span
diff --git a/testdata/features/checks.feature b/testdata/features/checks.feature
index 775d9e1a..49f96b46 100755
--- a/testdata/features/checks.feature
+++ b/testdata/features/checks.feature
@@ -79,6 +79,7 @@ Feature: Checks
             """
             test.md:5:5:Bugs.Newline:Use 'test' rather than 'linuxptp'.
             test.md:8:5:Bugs.Newline:Use 'test' rather than 'linuxptp'.
+            test.md:10:1:Bugs.URLCtx:Use 'Term' instead of 'term'
             """
 
     Scenario: Sequence
diff --git a/testdata/fixtures/checks/Substitution/.vale.ini b/testdata/fixtures/checks/Substitution/.vale.ini
index c485b085..c721e17d 100644
--- a/testdata/fixtures/checks/Substitution/.vale.ini
+++ b/testdata/fixtures/checks/Substitution/.vale.ini
@@ -6,3 +6,4 @@ Vocab = Cap
 BasedOnStyles = proselint
 
 Bugs.Newline = YES
+Bugs.URLCtx = YES
diff --git a/testdata/fixtures/checks/Substitution/test.md b/testdata/fixtures/checks/Substitution/test.md
index d3ab043c..2b2ede15 100644
--- a/testdata/fixtures/checks/Substitution/test.md
+++ b/testdata/fixtures/checks/Substitution/test.md
@@ -5,4 +5,9 @@ The congressman voted to pass the bill.
 The linuxptp resource.
 
 The `linuxptp` resource.
-The linuxptp resource.
\ No newline at end of file
+The linuxptp resource.
+
+term
+https://abc.com/term
+
+https://abc.com/term
\ No newline at end of file
diff --git a/testdata/styles/Bugs/URLCtx.yml b/testdata/styles/Bugs/URLCtx.yml
new file mode 100644
index 00000000..5a3f3415
--- /dev/null
+++ b/testdata/styles/Bugs/URLCtx.yml
@@ -0,0 +1,5 @@
+extends: substitution
+message: Use '%s' instead of '%s'
+level: error
+swap:
+  "term": Term