diff --git a/src/oxc/explore.md b/src/oxc/explore.md
index 4b0b025..7fd5a88 100644
--- a/src/oxc/explore.md
+++ b/src/oxc/explore.md
@@ -2,6 +2,33 @@
 
 <https://github.com/oxc-project/oxc>
 
+## oxc_codegen
+
+See more about sourcemaps on [oxc::oxc_sourcemaps](#oxc_sourcemap).
+
+<a href="https://github.com/oxc-project/oxc/blob/main/crates/oxc_codegen/src/lib.rs" title="Source Code of oxc_codegen">📄</a>
+
+## oxc_sourcemap
+
+> The sourcemap implement port from [rust-sourcemap](https://github.com/getsentry/rust-sourcemap), but has some different with it.
+>
+> Encode sourcemap at parallel, including quote sourceContent and encode token to vlq mappings.
+> Avoid Sourcemap some methods overhead, like SourceMap::tokens().
+
+The main interface for creating sourcemaps from existing files seems to be [`oxc::oxc_codegen::CodeGen::new().enable_source_map(&filename, &source_text).build()`](https://github.com/oxc-project/oxc/blob/main/crates/oxc_codegen/src/lib.rs) (or any other options allowed by the builder pattern).
+
+### Understand the relation about SourceMap between oxc_codegen and oxc_sourcemap
+
+- [`oxc::oxc_codegen::SourcemapBuilder`](https://github.com/oxc-project/oxc/blob/main/crates/oxc_codegen/src/sourcemap_builder.rs) vs [`oxc::oxc_sourcemap::SourceMapBuilder`](https://github.com/oxc-project/oxc/blob/main/crates/oxc_sourcemap/src/sourcemap_builder.rs) (map vs Map - may be a typo ?)
+  - [`oxc::oxc_codegen::Codegen`](https://github.com/oxc-project/oxc/blob/main/crates/oxc_codegen/src/lib.rs) contains a field `sourcemap_builder`: [`Option<oxc::oxc_codegen::SourcemapBuilder>`](https://github.com/oxc-project/oxc/blob/main/crates/oxc_codegen/src/sourcemap_builder.rs)
+  - `oxc::oxc_codegen::SourcemapBuilder` contains a field `sourcemap_builder`: [`oxc::oxc_sourcemap::SourceMapBuilder`](https://github.com/oxc-project/oxc/blob/main/crates/oxc_sourcemap/src/sourcemap_builder.rs)
+- `oxc::oxc_codegen::SourcemapBuilder` has `into_sourcemap(self) -> oxc::oxc_sourcemap::SourceMap`, which calls:
+  - `oxc::oxc_sourcemap::SourceMapBuilder` with `into_sourcemap(self) -> SourceMap`
+
+See more in [`oxc::oxc_codegen`](#oxc_codegen).
+
+<a href="https://github.com/oxc-project/oxc/blob/main/crates/oxc_sourcemap" title="Source Code of oxc_sourcemap">📄</a>
+
 ## oxc_span
 
 [`oxc::oxc_span::span::types`](https://github.com/oxc-project/oxc/blob/main/crates/oxc_span/src/span/types.rs)
@@ -14,3 +41,5 @@ let text = "foo bar baz";
 let span = Span::new(4, 7);
 assert_eq!(&text[span], "bar");
 ```
+
+<a href="https://github.com/oxc-project/oxc/blob/main/crates/oxc_span/src/lib.rs" title="Source Code of oxc_span">📄</a>
diff --git a/src/rolldown/explore-shared.md b/src/rolldown/explore-shared.md
index 4425292..dea8e35 100644
--- a/src/rolldown/explore-shared.md
+++ b/src/rolldown/explore-shared.md
@@ -127,6 +127,10 @@ Exposes `rolldown_rstr::Rstr` which is a thin wrapper over [`oxc::span::CompactS
 
 ## rolldown_sourcemap
 
-Exposes `collapse_sourcemaps(mut sourcemap_chain: Vec<&SourceMap>) -> SourceMap`.
+Exposes [`collapse_sourcemaps(mut sourcemap_chain: Vec<&SourceMap>) -> SourceMap`](https://github.com/rolldown/rolldown/blob/main/crates/rolldown_sourcemap/src/lib.rs).
+
+It collapses multiple sourcemaps generated by calls to `oxc::oxc_codegen::CodeGen::new().enable_source_map(&filename, &source_text).build()` into one giant sourcemap.
 
 Relies on [`oxc::sourcemap::*`](https://github.com/oxc-project/oxc/tree/main/crates/oxc_sourcemap).
+
+<a href="https://github.com/rolldown/rolldown/tree/main/crates/rolldown_sourcemap" title="Source Code of rolldown_sourcemap">📄</a>