diff --git a/syntaxes/metamodelica.tmGrammar.yaml b/syntaxes/metamodelica.tmGrammar.yaml
index c5f555b..0040081 100644
--- a/syntaxes/metamodelica.tmGrammar.yaml
+++ b/syntaxes/metamodelica.tmGrammar.yaml
@@ -120,7 +120,7 @@ patterns:
     end: \)\s*;
 
   # Documentation Strings
-  - match: (?<!else\s*)(?<![=+]\s*)((?<!\\)"([^"]|\\")*(?<!\\)")\s*;
+  - match: (?<!\bthen\s*)(?<!\belse\s*)(?<![=+]\s*)((?<!\\)"([^"]|\\")*(?<!\\)")\s*;
     captures:
       1:
         name: comment.line
diff --git a/test/metamodelica/Docstring.test.mo b/test/metamodelica/Docstring.test.mo
new file mode 100644
index 0000000..b6e5d4c
--- /dev/null
+++ b/test/metamodelica/Docstring.test.mo
@@ -0,0 +1,11 @@
+// SYNTAX TEST "source.metamodelica" "Doc string"
+
+function f
+algorithm
+  str := match some_var
+    case _ then "";
+//              ^^ source.metamodelica string.quoted.double
+    else "";
+//       ^^ source.metamodelica string.quoted.double
+  end match;
+end f;