diff --git a/.properties b/.properties
new file mode 100644
index 0000000..0957ed5
--- /dev/null
+++ b/.properties
@@ -0,0 +1,4 @@
+{
+    #format : #tonel,
+    #version: #'1.0'
+}
diff --git a/src/.properties b/src/.properties
index ad0471d..0957ed5 100644
--- a/src/.properties
+++ b/src/.properties
@@ -1,3 +1,4 @@
 {
-	#format : #tonel
-}
\ No newline at end of file
+    #format : #tonel,
+    #version: #'1.0'
+}
diff --git a/src/PetitYAML-Tests/PPYAMLGrammarTest.class.st b/src/PetitYAML-Tests/PPYAMLGrammarTest.class.st
index 7529d2a..cfbd4ea 100644
--- a/src/PetitYAML-Tests/PPYAMLGrammarTest.class.st
+++ b/src/PetitYAML-Tests/PPYAMLGrammarTest.class.st
@@ -647,6 +647,19 @@ PPYAMLGrammarTest >> test_c_l_literal_strip [
 	self assert: result = '# text'
 ]
 
+{ #category : #tests }
+PPYAMLGrammarTest >> test_c_single_qouted [
+	self parse: '''hi there''' rule: #c_single_quoted.
+	self assert: result = 'hi there'.
+	
+	self parse: ''' 1st non-empty
+
+ 2nd non-empty 
+ 3rd non-empty ''' rule: #c_single_quoted.
+	self assert: result = ' 1st non-empty
+2nd non-empty 3rd non-empty '
+]
+
 { #category : #spec }
 PPYAMLGrammarTest >> test_l_block_mapping [
 	context YAMLN: -1.
diff --git a/src/PetitYAML/PPYAMLGrammar.class.st b/src/PetitYAML/PPYAMLGrammar.class.st
index 7654a12..197581e 100644
--- a/src/PetitYAML/PPYAMLGrammar.class.st
+++ b/src/PetitYAML/PPYAMLGrammar.class.st
@@ -138,7 +138,17 @@ Class {
 		'l_block_sequence',
 		'l_block_mapping',
 		'l_bare_document',
-		'aligns'
+		'aligns',
+		's_single_escaped',
+		'nb_single_text',
+		'nb_single_multi_line',
+		'nb_single_one_line',
+		'nb_ns_single_in_line',
+		's_single_next_line',
+		'ns_single_char',
+		'nb_single_char',
+		's_single_break',
+		'c_single_quoted'
 	],
 	#category : #PetitYAML
 }
@@ -294,7 +304,7 @@ PPYAMLGrammar >> c_flow_indicator [
 PPYAMLGrammar >> c_flow_json_content [
 	^ 	c_flow_sequence / 
 		c_flow_mapping / 
-		"c_single_quoted /"
+		c_single_quoted /
 		c_double_quoted
 ]
 
@@ -467,6 +477,14 @@ PPYAMLGrammar >> c_s_implicit_json_key [
 	^	c_flow_json_node, s_separate_in_line optional ==> #first
 ]
 
+{ #category : #spec }
+PPYAMLGrammar >> c_single_quoted [
+	^ ($' asParser, nb_single_text, $' asParser) map: [ :first :text :second |
+		"first asString, text, second asString"
+		text
+	] 
+]
+
 { #category : #spec }
 PPYAMLGrammar >> e_node [
 	^ e_scalar
@@ -748,6 +766,39 @@ PPYAMLGrammar >> nb_ns_plain_in_line [
 	^  (s_white star, ns_plain_char) star flatten
 ]
 
+{ #category : #spec }
+PPYAMLGrammar >> nb_ns_single_in_line [ 	
+	^ ( s_white star, ns_single_char) star flatten 
+]
+
+{ #category : #spec }
+PPYAMLGrammar >> nb_single_char [
+	^ ($/ asParser not,  $' asParser not), nb_json ==> #third
+]
+
+{ #category : #spec }
+PPYAMLGrammar >> nb_single_multi_line [ 	
+ 	^ nb_ns_single_in_line, (s_single_next_line / (s_white star flatten)) 
+	
+	map: [ :first :rest | 
+		first, rest
+	]
+]
+
+{ #category : #spec }
+PPYAMLGrammar >> nb_single_one_line [ 	
+	^ nb_single_char star flatten
+]
+
+{ #category : #spec }
+PPYAMLGrammar >> nb_single_text [
+	^ 
+	(nb_single_multi_line if: [:context | context YAMLContext = #'flow-out' ]) /
+	(nb_single_multi_line if: [:context | context YAMLContext = #'flow-in' ]) /
+	(nb_single_one_line if: [:context | context YAMLContext = #'block-key' ]) /
+	(nb_single_one_line if: [:context | context YAMLContext = #'flow-key' ])
+]
+
 { #category : #spec }
 PPYAMLGrammar >> ns_char [
 	^  	s_white not, nb_char ==> #second
@@ -989,6 +1040,11 @@ PPYAMLGrammar >> ns_s_implicit_yaml_key [
 	^ ns_flow_yaml_node, s_separate_in_line optional ==> #first
 ]
 
+{ #category : #spec }
+PPYAMLGrammar >> ns_single_char [ 
+	^ s_white not, nb_single_char  ==> #second
+]
+
 { #category : #spec }
 PPYAMLGrammar >> s_b_comment [ 	
 	^ ( s_separate_in_line, c_nb_comment_text optional ) optional, b_comment
@@ -1185,6 +1241,35 @@ PPYAMLGrammar >> s_separate_lines [
 		s_separate_in_line
 ]
 
+{ #category : #spec }
+PPYAMLGrammar >> s_single_break [
+	^ s_flow_folded / s_single_escaped
+]
+
+{ #category : #spec }
+PPYAMLGrammar >> s_single_escaped [
+	^ PPFailingParser message: 's_singlw_escaped not yet implemented'
+]
+
+{ #category : #spec }
+PPYAMLGrammar >> s_single_next_line [
+	^ s_single_break, ( ns_single_char, nb_ns_single_in_line, 
+		(s_single_next_line / (s_white star flatten))) optional 
+		
+	map: [ :break :rest |
+		| retval |
+		retval := break.
+		rest ifNotNil: [ 
+			retval := retval, rest first asString.
+			retval := retval, rest second.
+			rest third ifNotNil: [ 
+				retval := retval, rest third.
+			].
+			retval
+		]
+	].
+]
+
 { #category : #spec }
 PPYAMLGrammar >> s_space [
 	^ Character space asParser