diff --git a/grammar.js b/grammar.js
index 926684a..72ae457 100644
--- a/grammar.js
+++ b/grammar.js
@@ -36,7 +36,7 @@ module.exports = grammar({
 
 		large: $ => /[A-Z_\d]+/,
 
-		string: $ => /[A-Za-z ]+/,
+		string: $ => /[A-Za-z \-,.']+/,
 
 		separator: $ => /:/,
 
diff --git a/src/grammar.json b/src/grammar.json
index 8ce716d..e6c80bd 100644
--- a/src/grammar.json
+++ b/src/grammar.json
@@ -121,7 +121,7 @@
     },
     "string": {
       "type": "PATTERN",
-      "value": "[A-Za-z ]+"
+      "value": "[A-Za-z \\-,.']+"
     },
     "separator": {
       "type": "PATTERN",
diff --git a/src/parser.c b/src/parser.c
index 355d021..9ab41cc 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -181,7 +181,9 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
           lookahead == '\r') SKIP(1)
       if (('0' <= lookahead && lookahead <= '9')) ADVANCE(9);
       if (('A' <= lookahead && lookahead <= 'Z')) ADVANCE(7);
-      if (('a' <= lookahead && lookahead <= 'z')) ADVANCE(11);
+      if (lookahead == '\'' ||
+          (',' <= lookahead && lookahead <= '.') ||
+          ('a' <= lookahead && lookahead <= 'z')) ADVANCE(11);
       END_STATE();
     case 2:
       if (lookahead == '\t' ||
@@ -217,6 +219,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
           lookahead == '_') ADVANCE(8);
       if (('A' <= lookahead && lookahead <= 'Z')) ADVANCE(7);
       if (lookahead == ' ' ||
+          lookahead == '\'' ||
+          (',' <= lookahead && lookahead <= '.') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(11);
       END_STATE();
     case 8:
@@ -234,11 +238,15 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       if (lookahead == ' ') ADVANCE(10);
       if (('0' <= lookahead && lookahead <= '9')) ADVANCE(9);
       if (('A' <= lookahead && lookahead <= 'Z')) ADVANCE(7);
-      if (('a' <= lookahead && lookahead <= 'z')) ADVANCE(11);
+      if (lookahead == '\'' ||
+          (',' <= lookahead && lookahead <= '.') ||
+          ('a' <= lookahead && lookahead <= 'z')) ADVANCE(11);
       END_STATE();
     case 11:
       ACCEPT_TOKEN(sym_string);
       if (lookahead == ' ' ||
+          lookahead == '\'' ||
+          (',' <= lookahead && lookahead <= '.') ||
           ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(11);
       END_STATE();
diff --git a/test/corpus/test.txt b/test/corpus/test.txt
index e9d8ee2..5f1b2d1 100644
--- a/test/corpus/test.txt
+++ b/test/corpus/test.txt
@@ -7,6 +7,7 @@ opening_comment
 [TEST:BODY_1PART] comment here
 	[MULTIPLE:string:123:LARGE]
 	[SINGLE_TEST]
+	[HERE:A string, contating lot's of diffent punctuation.]
 
 ---
 
@@ -30,4 +31,9 @@ opening_comment
 			(large)))
 	(bracket_statement
 		(parameter_list
-			(declaration))))
+			(declaration)))
+	(bracket_statement
+		(parameter_list
+			(declaration)
+			(separator)
+			(string))))