diff --git a/core-foundation-sys/src/lib.rs b/core-foundation-sys/src/lib.rs
index c8468c2..16df21a 100644
--- a/core-foundation-sys/src/lib.rs
+++ b/core-foundation-sys/src/lib.rs
@@ -44,6 +44,7 @@ pub mod set;
 pub mod socket;
 pub mod stream;
 pub mod string;
+pub mod string_tokenizer;
 pub mod timezone;
 pub mod url;
 #[cfg(target_os = "macos")]
diff --git a/core-foundation-sys/src/string_tokenizer.rs b/core-foundation-sys/src/string_tokenizer.rs
new file mode 100644
index 0000000..f4c23d4
--- /dev/null
+++ b/core-foundation-sys/src/string_tokenizer.rs
@@ -0,0 +1,65 @@
+// Copyright 2023 The Servo Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use std::os::raw::c_void;
+
+use base::{CFAllocatorRef, CFTypeID, CFRange, CFIndex, CFOptionFlags, CFTypeRef};
+use string::CFStringRef;
+use locale::CFLocaleRef;
+use array::CFMutableArrayRef;
+
+#[repr(C)]
+pub struct __CFStringTokenizer(c_void);
+pub type CFStringTokenizerRef = *mut __CFStringTokenizer;
+
+pub type CFStringTokenizerTokenType = CFOptionFlags;
+
+pub const kCFStringTokenizerTokenNone: CFStringTokenizerTokenType = 0;
+pub const kCFStringTokenizerTokenNormal: CFStringTokenizerTokenType = 1 << 0;
+pub const kCFStringTokenizerTokenHasSubTokensMask: CFStringTokenizerTokenType = 1 << 1;
+pub const kCFStringTokenizerTokenHasDerivedSubTokensMask: CFStringTokenizerTokenType = 1 << 2;
+pub const kCFStringTokenizerTokenHasHasNumbersMask: CFStringTokenizerTokenType = 1 << 3;
+pub const kCFStringTokenizerTokenHasNonLettersMask: CFStringTokenizerTokenType = 1 << 4;
+pub const kCFStringTokenizerTokenIsCJWordMask: CFStringTokenizerTokenType = 1 << 5;
+
+/* Tokenization Modifiers */
+pub const kCFStringTokenizerUnitWord: CFOptionFlags = 0;
+pub const kCFStringTokenizerUnitSentence: CFOptionFlags = 1;
+pub const kCFStringTokenizerUnitParagraph: CFOptionFlags = 2;
+pub const kCFStringTokenizerUnitLineBreak: CFOptionFlags = 3;
+pub const kCFStringTokenizerUnitWordBoundary: CFOptionFlags = 4;
+pub const kCFStringTokenizerAttributeLatinTranscription: CFOptionFlags = 1 << 16;
+pub const kCFStringTokenizerAttributeLanguage: CFOptionFlags = 1 << 17;
+
+extern {
+    /*
+     * CFStringTokenizer.h
+     */
+
+    /* Creating a Tokenizer */
+    pub fn CFStringTokenizerCreate(alloc: CFAllocatorRef, string: CFStringRef, range: CFRange, options: CFOptionFlags, locale: CFLocaleRef) -> CFStringTokenizerRef;
+
+    /* Setting the String */
+    pub fn CFStringTokenizerSetString(tokenizer: CFStringTokenizerRef, string: CFStringRef, range: CFRange);
+
+    /* Changing the Location */
+    pub fn CFStringTokenizerAdvanceToNextToken(tokenizer: CFStringTokenizerRef) -> CFStringTokenizerTokenType;
+    pub fn CFStringTokenizerGoToTokenAtIndex(tokenizer: CFStringTokenizerRef, index: CFIndex) -> CFStringTokenizerTokenType;
+
+    /* Getting Information About the Current Token */
+    pub fn CFStringTokenizerCopyCurrentTokenAttribute(tokenizer: CFStringTokenizerRef, attribute: CFOptionFlags) -> CFTypeRef;
+    pub fn CFStringTokenizerGetCurrentTokenRange(tokenizer: CFStringTokenizerRef) -> CFRange;
+    pub fn CFStringTokenizerGetCurrentSubTokens(tokenizer: CFStringTokenizerRef, ranges: *mut CFRange, maxRangeLength: CFIndex, derivedSubTokens: CFMutableArrayRef) -> CFIndex;
+
+    /* Identifying a Language */
+    pub fn CFStringTokenizerCopyBestStringLanguage(string: CFStringRef, range: CFRange) -> CFStringRef;
+
+    /* Getting the CFStringTokenizer Type ID */
+    pub fn CFStringTokenizerGetTypeID() -> CFTypeID;
+}