diff --git a/.vscode/C4.code-snippets b/.vscode/C4.code-snippets
index 76c64c2..8766176 100644
--- a/.vscode/C4.code-snippets
+++ b/.vscode/C4.code-snippets
@@ -257,6 +257,24 @@
 		],
 		"description": "Add unidirectional Relationship with Technology to C4 diagram"
 	},
+	"C4_Relationship_Bi": {
+		"scope": "diagram",
+		"prefix": "Bidirectional Relationship",
+		"body": [
+			"BiRel(${1:from_alias}, ${2:to_alias}, \"${3:label}\")",
+			"$0"
+		],
+		"description": "Add bidirectional Relationship to C4 diagram"
+	},
+	"C4_Relationship_Bi_Techn": {
+		"scope": "diagram",
+		"prefix": "Bidirectional Relationship with Technology",
+		"body": [
+			"BiRel(${1:from_alias}, ${2:to_alias}, \"${3:label}\", \"${4:technology}\")",
+			"$0"
+		],
+		"description": "Add bidirectional Relationship with Technology to C4 diagram"
+	},
 	"C4_Relationship_Index": {
 		"scope": "diagram",
 		"prefix": "Relationship with Index",
diff --git a/C4.puml b/C4.puml
index 4ed5532..9f6a90b 100644
--- a/C4.puml
+++ b/C4.puml
@@ -95,6 +95,13 @@ Rel_($from, $to, $label, "-->>")
 Rel_($from, $to, $label, $techn, "-->>")
 !endprocedure
 
+!unquoted procedure BiRel($from, $to, $label)
+Rel_($from, $to, $label, "<<-->>")
+!endprocedure
+!unquoted procedure BiRel($from, $to, $label, $techn)
+Rel_($from, $to, $label, $techn, "<<-->>")
+!endprocedure
+
 !unquoted procedure Rel_Back($from, $to, $label)
 Rel_($from, $to, $label, "<<--")
 !endprocedure
@@ -129,6 +136,19 @@ Rel_($from, $to, $label, "-DOWN->>")
 Rel_($from, $to, $label, $techn, "-DOWN->>")
 !endprocedure
 
+!unquoted procedure BiRel_D($from, $to, $label)
+Rel_($from, $to, $label, "<<-DOWN->>")
+!endprocedure
+!unquoted procedure BiRel_D($from, $to, $label, $techn)
+Rel_($from, $to, $label, $techn, "<<-DOWN->>")
+!endprocedure
+!unquoted procedure BiRel_Down($from, $to, $label)
+Rel_($from, $to, $label, "<<-DOWN->>")
+!endprocedure
+!unquoted procedure BiRel_Down($from, $to, $label, $techn)
+Rel_($from, $to, $label, $techn, "<<-DOWN->>")
+!endprocedure
+
 !unquoted procedure Rel_U($from, $to, $label)
 Rel_($from, $to, $label, "-UP->>")
 !endprocedure
@@ -142,6 +162,19 @@ Rel_($from, $to, $label, "-UP->>")
 Rel_($from, $to, $label, $techn, "-UP->>")
 !endprocedure
 
+!unquoted procedure BiRel_U($from, $to, $label)
+Rel_($from, $to, $label, "<<-UP->>")
+!endprocedure
+!unquoted procedure BiRel_U($from, $to, $label, $techn)
+Rel_($from, $to, $label, $techn, "<<-UP->>")
+!endprocedure
+!unquoted procedure BiRel_Up($from, $to, $label)
+Rel_($from, $to, $label, "<<-UP->>")
+!endprocedure
+!unquoted procedure BiRel_Up($from, $to, $label, $techn)
+Rel_($from, $to, $label, $techn, "<<-UP->>")
+!endprocedure
+
 !unquoted procedure Rel_L($from, $to, $label)
 Rel_($from, $to, $label, "-LEFT->>")
 !endprocedure
@@ -155,6 +188,19 @@ Rel_($from, $to, $label, "-LEFT->>")
 Rel_($from, $to, $label, $techn, "-LEFT->>")
 !endprocedure
 
+!unquoted procedure BiRel_L($from, $to, $label)
+Rel_($from, $to, $label, "<<-LEFT->>")
+!endprocedure
+!unquoted procedure BiRel_L($from, $to, $label, $techn)
+Rel_($from, $to, $label, $techn, "<<-LEFT->>")
+!endprocedure
+!unquoted procedure BiRel_Left($from, $to, $label)
+Rel_($from, $to, $label, "<<-LEFT->>")
+!endprocedure
+!unquoted procedure BiRel_Left($from, $to, $label, $techn)
+Rel_($from, $to, $label, $techn, "<<-LEFT->>")
+!endprocedure
+
 !unquoted procedure Rel_R($from, $to, $label)
 Rel_($from, $to, $label, "-RIGHT->>")
 !endprocedure
@@ -168,6 +214,19 @@ Rel_($from, $to, $label, "-RIGHT->>")
 Rel_($from, $to, $label, $techn, "-RIGHT->>")
 !endprocedure
 
+!unquoted procedure BiRel_R($from, $to, $label)
+Rel_($from, $to, $label, "<<-RIGHT->>")
+!endprocedure
+!unquoted procedure BiRel_R($from, $to, $label, $techn)
+Rel_($from, $to, $label, $techn, "<<-RIGHT->>")
+!endprocedure
+!unquoted procedure BiRel_Right($from, $to, $label)
+Rel_($from, $to, $label, "<<-RIGHT->>")
+!endprocedure
+!unquoted procedure BiRel_Right($from, $to, $label, $techn)
+Rel_($from, $to, $label, $techn, "<<-RIGHT->>")
+!endprocedure
+
 ' Layout Helpers
 ' ##################################