diff --git a/litellm-rust/crates/core/src/providers/anthropic/messages/transformation.rs b/litellm-rust/crates/core/src/providers/anthropic/messages/transformation.rs
index 829f2260d3c..79e59589d6e 100644
--- a/litellm-rust/crates/core/src/providers/anthropic/messages/transformation.rs
+++ b/litellm-rust/crates/core/src/providers/anthropic/messages/transformation.rs
@@ -10,10 +10,12 @@ pub struct AnthropicMessagesConfig;
 
 pub const ANTHROPIC_MESSAGES_CONFIG: AnthropicMessagesConfig = AnthropicMessagesConfig;
 
+// rust-only: Option-normalization helper, Rust idiom
 pub fn non_empty(value: Option<&str>) -> Option<&str> {
     value.map(str::trim).filter(|value| !value.is_empty())
 }
 
+// python-parity: validate_anthropic_messages_environment
 pub fn resolve_anthropic_api_key(
     api_key: Option<&str>,
     env_lookup: &dyn Fn(&str) -> Option<String>,