diff --git a/docs/index.md b/docs/index.md
index ab0c229ede..6748b17c5c 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -187,6 +187,7 @@ OPTIONS:
         --rust-output <rust-output>                            Path of output generated Rust code
         --class-name <class-name>                              Generated class name
         --dart-format-line-length <dart-format-line-length>    Line length for dart formatting
+        --llvm-path <llvm-path>                                Path to the installed LLVM
 ```
 
 ## What this library is & isn't
diff --git a/frb_codegen/README.md b/frb_codegen/README.md
index ab0c229ede..6748b17c5c 100644
--- a/frb_codegen/README.md
+++ b/frb_codegen/README.md
@@ -187,6 +187,7 @@ OPTIONS:
         --rust-output <rust-output>                            Path of output generated Rust code
         --class-name <class-name>                              Generated class name
         --dart-format-line-length <dart-format-line-length>    Line length for dart formatting
+        --llvm-path <llvm-path>                                Path to the installed LLVM
 ```
 
 ## What this library is & isn't
diff --git a/frb_dart/CHANGELOG.md b/frb_dart/CHANGELOG.md
index 2a73ea5872..cc5a176e2e 100644
--- a/frb_dart/CHANGELOG.md
+++ b/frb_dart/CHANGELOG.md
@@ -1,10 +1,11 @@
-## Unreleased
+## 1.2.1
 
 * Add `--skip-add-mod-to-lib` flag.
 * Allow Rust input file in directories besides root directory of the crate.
 * Warn when command's output seems to indicate errors.
 * Do not include `stdarg.h` automatically (related: #108 and #53).
-* Fix windows path handling problem (#119, thanks @smw-wagnerma)
+* Fix windows path handling problem (#119, thanks @smw-wagnerma).
+* Add `--llvm-path` flag.
 
 ## 1.2.0
 
diff --git a/frb_dart/README.md b/frb_dart/README.md
index ab0c229ede..6748b17c5c 100644
--- a/frb_dart/README.md
+++ b/frb_dart/README.md
@@ -187,6 +187,7 @@ OPTIONS:
         --rust-output <rust-output>                            Path of output generated Rust code
         --class-name <class-name>                              Generated class name
         --dart-format-line-length <dart-format-line-length>    Line length for dart formatting
+        --llvm-path <llvm-path>                                Path to the installed LLVM
 ```
 
 ## What this library is & isn't
diff --git a/frb_rust/README.md b/frb_rust/README.md
index ab0c229ede..6748b17c5c 100644
--- a/frb_rust/README.md
+++ b/frb_rust/README.md
@@ -187,6 +187,7 @@ OPTIONS:
         --rust-output <rust-output>                            Path of output generated Rust code
         --class-name <class-name>                              Generated class name
         --dart-format-line-length <dart-format-line-length>    Line length for dart formatting
+        --llvm-path <llvm-path>                                Path to the installed LLVM
 ```
 
 ## What this library is & isn't