diff --git a/src/openapi/portfolio/portfolio.yaml b/src/openapi/portfolio/portfolio.yaml
index 5fd60e6a0..dcfba328d 100644
--- a/src/openapi/portfolio/portfolio.yaml
+++ b/src/openapi/portfolio/portfolio.yaml
@@ -703,6 +703,21 @@ components:
           maxItems: 5
           items:
             type: string
+            enum:
+              - eth-mainnet
+              - matic-mainnet
+              - arb-mainnet
+              - opt-mainnet
+              - base-mainnet
+              - bnb-mainnet
+              - celo-mainnet
+              - ronin-mainnet
+              - monad-mainnet
+              - monad-testnet
+              - robinhood-mainnet
+              - robinhood-testnet
+              - arc-mainnet
+              - arc-testnet
             default: eth-mainnet
           default:
             - eth-mainnet
@@ -710,8 +725,8 @@ components:
             - matic-mainnet
           description: >
             Networks to query. Defaults to Ethereum, Base, and Polygon mainnet (same as the
-            other Portfolio APIs). You can query up to 5 networks. Reach out if you need more.
-            Find network enums [here](https://dashboard.alchemy.com/chains).
+            other Portfolio APIs). You can query up to 5 networks per request. Reach out if
+            you need more.
         fromTimestamp:
           type: string
           format: date-time
@@ -748,6 +763,12 @@ components:
           description: >
             Transfer categories to fetch. **Required**, with no default — provide one or more of
             the listed categories.
+
+
+            **Network support for `internal`:** the `internal` category is only supported on
+            Ethereum Mainnet (`eth-mainnet`), Base Mainnet (`base-mainnet`), Polygon Mainnet
+            (`matic-mainnet`), Arc Mainnet (`arc-mainnet`), and Arc Testnet (`arc-testnet`).
+            All other categories are supported on every network listed under `networks`.
         contractAddresses:
           type: array
           items:
diff --git a/src/openapi/portfolio/transfers/by-address.yaml b/src/openapi/portfolio/transfers/by-address.yaml
index 6b0b6cacc..70d198b27 100644
--- a/src/openapi/portfolio/transfers/by-address.yaml
+++ b/src/openapi/portfolio/transfers/by-address.yaml
@@ -6,8 +6,12 @@ description: >
 
   Fetches historical transfers (native, ERC-20, ERC-721, ERC-1155, special NFT, and internal) for
   a single wallet address and multiple networks. Returns a list of transfers ordered by
-  `blockTimestamp`. This endpoint supports Ethereum and many EVM chains. See the full list of
-  supported networks [here](https://dashboard.alchemy.com/chains).
+  `blockTimestamp`. Supported on 14 EVM networks — see the `networks` request-body field for
+  the enumerated list.
+
+
+  Note: the `internal` category is only supported on Ethereum Mainnet, Base Mainnet, Polygon
+  Mainnet, Arc Mainnet, and Arc Testnet.
 
 
   This endpoint fans out across every requested network and merges the results. If one or more