diff --git a/src/source/index.ts b/src/source/index.ts
index f2d82fd..5012030 100644
--- a/src/source/index.ts
+++ b/src/source/index.ts
@@ -9,6 +9,7 @@ export * from "./any_source_component"
 export * from "./source_port"
 export * from "./source_trace"
 export * from "./base/source_component_base"
+export * from "./pin_attributes"
 export * from "./source_group"
 export * from "./source_net"
 export * from "./source_simple_battery"
diff --git a/src/source/pin_attributes.ts b/src/source/pin_attributes.ts
new file mode 100644
index 0000000..6132dad
--- /dev/null
+++ b/src/source/pin_attributes.ts
@@ -0,0 +1,15 @@
+import { z } from "zod"
+import { expectTypesMatch } from "src/utils/expect-types-match"
+
+export const pin_attributes = z.object({
+  rats_nest_color: z.string().optional(),
+})
+
+export type PinAttributesInput = z.input<typeof pin_attributes>
+type InferredPinAttributes = z.infer<typeof pin_attributes>
+
+export interface PinAttributes {
+  rats_nest_color?: string
+}
+
+expectTypesMatch<PinAttributes, InferredPinAttributes>(true)
diff --git a/src/source/source_net.ts b/src/source/source_net.ts
index 2c88757..814f003 100644
--- a/src/source/source_net.ts
+++ b/src/source/source_net.ts
@@ -14,6 +14,7 @@ export const source_net = z.object({
   trace_width: z.number().optional(),
   subcircuit_id: z.string().optional(),
   subcircuit_connectivity_map_key: z.string().optional(),
+  rats_nest_color: z.string().optional(),
 })
 
 export type SourceNetInput = z.input<typeof source_net>
@@ -32,6 +33,7 @@ export interface SourceNet {
   trace_width?: number
   subcircuit_id?: string
   subcircuit_connectivity_map_key?: string
+  rats_nest_color?: string
 }
 
 expectTypesMatch<SourceNet, InferredSourceNet>(true)
diff --git a/src/source/source_port.ts b/src/source/source_port.ts
index 7f7b51e..662708a 100644
--- a/src/source/source_port.ts
+++ b/src/source/source_port.ts
@@ -1,5 +1,6 @@
 import { z } from "zod"
 import { expectTypesMatch } from "src/utils/expect-types-match"
+import { pin_attributes, type PinAttributes } from "./pin_attributes"
 
 export const source_port = z.object({
   type: z.literal("source_port"),
@@ -10,6 +11,7 @@ export const source_port = z.object({
   source_component_id: z.string(),
   subcircuit_id: z.string().optional(),
   subcircuit_connectivity_map_key: z.string().optional(),
+  pin_attributes: pin_attributes.optional(),
 })
 
 export type SourcePortInput = z.input<typeof source_port>
@@ -27,6 +29,7 @@ export interface SourcePort {
   source_component_id: string
   subcircuit_id?: string
   subcircuit_connectivity_map_key?: string
+  pin_attributes?: PinAttributes
 }
 
 expectTypesMatch<SourcePort, InferredSourcePort>(true)