diff --git a/credible/backtesting-reference.mdx b/credible/backtesting-reference.mdx
index d6c9e90..f2cb18a 100644
--- a/credible/backtesting-reference.mdx
+++ b/credible/backtesting-reference.mdx
@@ -77,10 +77,15 @@ Controls how transactions are detected in the block range.
 **`false`:** Scans each block individually
 - One `eth_getBlockByNumber` call per block
 - Only detects direct calls where `tx.to == targetContract`
+- Does not detect internal calls (e.g., when another contract calls your target contract through a router or aggregator)
 - **RPC calls for 100 blocks:** ~100 calls
 
 Use `trace_filter` for large block ranges or when you need to detect internal calls. Use block scanning when your RPC provider doesn't support `trace_filter`.
 
+<Note>
+Not all RPC providers support `trace_filter`, and some providers only support it on certain networks. Check your provider's documentation to confirm `trace_filter` availability for your target chain.
+</Note>
+
 ```solidity
 useTraceFilter: true  // Recommended for most cases
 useTraceFilter: false // For RPC providers and endpoints without trace_filter support
diff --git a/credible/backtesting.mdx b/credible/backtesting.mdx
index 9354d12..e70cd63 100644
--- a/credible/backtesting.mdx
+++ b/credible/backtesting.mdx
@@ -17,8 +17,8 @@ Backtesting operates in two phases:
 2. **Transaction Validation**: Replays each transaction with your assertion enabled
 
 The tool fetches transactions using one of two methods:
-- **trace_filter API** (recommended): Single RPC call for the entire block range, detects internal calls
-- **Block scanning**: One RPC call per block, detects only direct calls
+- **trace_filter API** (recommended): Single RPC call for the entire block range, detects both direct and internal calls (e.g., when Contract A calls your target Contract B through a router or aggregator)
+- **Block scanning**: One RPC call per block, detects only direct calls where `tx.to` equals your target contract (does not detect internal calls)
 
 For validation, the tool forks the EVM at each transaction to the target contract and replays it against the specified assertion.