diff --git a/extension.toml b/extension.toml
index 961f380..0d5c179 100644
--- a/extension.toml
+++ b/extension.toml
@@ -23,3 +23,11 @@ path = "grammars/interface"
 [grammars.dune]
 repository = "https://github.com/WHForks/tree-sitter-dune"
 commit = "b3f7882e1b9a1d8811011bf6f0de1c74c9c93949"
+
+[grammars.reasonml]
+repository = "https://github.com/reasonml-editor/tree-sitter-reason"
+commit = "0226cfecaa2257d56d7c3f364f789cba042e403f"
+
+[grammars.reasonml_interface]
+repository = "https://github.com/reasonml-editor/tree-sitter-reason"
+commit = "0226cfecaa2257d56d7c3f364f789cba042e403f"
diff --git a/languages/reasonml-interface/config.toml b/languages/reasonml-interface/config.toml
new file mode 100644
index 0000000..6e3bb51
--- /dev/null
+++ b/languages/reasonml-interface/config.toml
@@ -0,0 +1,12 @@
+name = "ReasonML Interface"
+code_fence_block_name = "reasonml"
+grammar = "reasonml_interface"
+path_suffixes = ["rei"]
+block_comment = ["/* ", " */"]
+autoclose_before = ";,=)}"
+brackets = [
+    { start = "{", end = "}", close = true, newline = true },
+    { start = "[", end = "]", close = true, newline = true },
+    { start = "(", end = ")", close = true, newline = true },
+]
+tab_size = 2
diff --git a/languages/reasonml-interface/highlights.scm b/languages/reasonml-interface/highlights.scm
new file mode 120000
index 0000000..e713fa8
--- /dev/null
+++ b/languages/reasonml-interface/highlights.scm
@@ -0,0 +1 @@
+../reasonml/highlights.scm
\ No newline at end of file
diff --git a/languages/reasonml/config.toml b/languages/reasonml/config.toml
new file mode 100644
index 0000000..bc00660
--- /dev/null
+++ b/languages/reasonml/config.toml
@@ -0,0 +1,20 @@
+name = "ReasonML"
+grammar = "reasonml"
+path_suffixes = ["re"]
+block_comment = ["/* ", " */"]
+autoclose_before = ";,=)}]"
+brackets = [
+    { start = "{", end = "}", close = true, newline = true },
+    { start = "{|", end = "|", close = true, newline = true, not_in = [
+        "string",
+    ] },
+    { start = "[", end = "]", close = true, newline = true },
+    { start = "[|", end = "|", close = true, newline = true, not_in = [
+        "string",
+    ] },
+    { start = "(", end = ")", close = true, newline = true },
+    { start = "\"", end = "\"", close = true, newline = false, not_in = [
+        "string",
+    ] },
+]
+tab_size = 2
diff --git a/languages/reasonml/highlights.scm b/languages/reasonml/highlights.scm
new file mode 100644
index 0000000..faff961
--- /dev/null
+++ b/languages/reasonml/highlights.scm
@@ -0,0 +1,362 @@
+;; (call (expression (_) @function))
+;;
+;; (type_identifier) @type
+;; (type_variant_identifier) @constructor
+;; (variant_identifier) @constructor
+;; (constructor_name) @constructor
+;; (module_name) @module
+;;
+;; (comment) @comment
+;;
+;; (number) @string
+;;
+;; ["open" "module"
+;;  "let"
+;;  "type"
+;;  "switch"] @keyword
+;;
+;; ["?"] @operator
+;; "." @punctuation
+;;
+;; ; ["+" "/" "*" "-"] @operator
+;;
+;; ["if" "else"] @keyword.conditional
+
+;; OCAML
+
+; Modules
+;--------
+[(module_name)
+ (module_type_name)] @module
+
+; Types
+;------
+((type_constructor) @type.builtin
+  (#any-of? @type.builtin
+    "int" "char" "bytes" "string" "float" "bool" "unit" "exn" "array" "list" "option" "int32"
+    "int64" "nativeint" "format6" "lazy_t"))
+
+[(class_name)
+ (class_type_name)
+ (type_constructor)] @type
+
+[(constructor_name)
+ (tag)] @constructor
+
+; Variables
+;----------
+[(value_name)
+ (type_variable)] @variable
+
+(value_pattern) @variable.parameter
+
+; Functions
+;----------
+
+; (let_binding
+;   pattern: (value_name) @function
+;   (parameter))
+
+; (let_binding
+;   pattern: (value_name) @function
+;   body:
+;     [(fun_expression)
+;      (function_expression)])
+
+
+(value_specification
+  (value_name) @function)
+
+(external
+  (value_name) @function)
+
+(method_name) @function.method
+
+; Application
+;------------
+(infix_expression
+  left:
+    (value_path
+      (value_name) @function.call)
+  operator: (concat_operator) @_operator
+  (#eq? @_operator "@@"))
+
+(infix_expression
+  operator: (rel_operator) @_operator
+  right:
+    (value_path
+      (value_name) @function.call)
+  (#eq? @_operator "|>"))
+
+; (application_expression
+;   function:
+;     (value_path
+;       (value_name) @function.call))
+
+((value_name) @function.builtin
+  (#any-of? @function.builtin "raise" "raise_notrace" "failwith" "invalid_arg"))
+
+; Fields
+;-------
+[(field_name)
+ (instance_variable_name)] @variable.member
+
+; Labels
+; ------
+(label_name) @label
+
+; Constants
+;----------
+; Don't let normal parens take priority over this
+((unit) @constant.builtin
+  (#set! "priority" 105))
+
+(boolean) @boolean
+
+[(number)
+ (signed_number)] @number
+
+(character) @character
+
+(string) @string
+
+(quoted_string
+  "{" @string
+  "}" @string) @string
+
+(escape_sequence) @string.escape
+
+[(conversion_specification)
+ (pretty_printing_indication)] @string.special
+
+; Keywords
+;---------
+[
+  "and"
+  "as"
+  "assert"
+  "begin"
+  "class"
+  "constraint"
+  "end"
+  "external"
+  "in"
+  "inherit"
+  "initializer"
+  "let"
+  "match"
+  "method"
+  "module"
+  "new"
+  "object"
+  "of"
+  "sig"
+  "struct"
+  "type"
+  "val"
+  "when"
+  "with" ] @keyword
+
+[
+  "lazy"
+  "mutable"
+  "nonrec"
+  "rec"
+  "private"
+  "virtual" ] @type.qualifier
+
+; [
+;   "fun"
+;   "function"
+;   "functor" ] @keyword.function
+
+[
+  "if"
+  "then"
+  "else"] @keyword.conditional
+
+[
+  "exception"
+  "try" ] @keyword.exception
+
+[
+  "include"
+  "open" ] @keyword.import
+
+[
+  "for"
+  "to"
+  "downto"
+  "while"
+  "do"
+  "done" ] @keyword.repeat
+
+; Punctuation
+;------------
+
+; (attribute
+;   [
+;     "[@"
+;     "]" ] @punctuation.special)
+
+(item_attribute
+  ["[@@" "]"] @punctuation.special)
+
+(floating_attribute
+  ["[@@@" "]"] @punctuation.special)
+
+(extension
+  ["[%" "]"] @punctuation.special)
+
+(item_extension
+  ["[%%" "]"] @punctuation.special)
+
+(quoted_extension
+  ["{%" "}"] @punctuation.special)
+
+(quoted_item_extension
+  ["{%%" "}"] @punctuation.special)
+
+"%" @punctuation.special
+
+[
+  "("
+  ")"
+  "["
+  "]"
+  "{"
+  "}"
+  "[|"
+  "|]"
+  "[<"
+  "[>" ] @punctuation.bracket
+
+(object_type
+  ["<" ">"] @punctuation.bracket)
+
+[
+  ","
+  "."
+  ";"
+  ":"
+  "="
+  "|"
+  "~"
+  "?"
+  "+"
+  "-"
+  "!"
+  ">"
+  "&"
+  "->"
+  ";;"
+  ":>"
+  ; "+="
+  ":="
+  ".." ] @punctuation.delimiter
+
+; Operators
+;----------
+[
+  (prefix_operator)
+  (sign_operator)
+  (pow_operator)
+  (mult_operator)
+  (add_operator)
+  (concat_operator)
+  (rel_operator)
+  (and_operator)
+  (or_operator)
+  (assign_operator)
+  (hash_operator)
+  (indexing_operator)
+  (let_operator)
+  (and_operator)
+  (match_operator)] @operator
+
+; (match_expression
+;   (match_operator)) @keyword
+
+(value_definition
+  [(let_operator)
+   (let_and_operator)] @keyword)
+
+[
+  "*"
+  "#"
+  "::"
+  "<-" ] @operator
+
+; Attributes
+;-----------
+(attribute_id) @attribute
+
+; Comments
+;---------
+[
+  (comment)
+  (line_number_directive)
+  (directive)] @comment @spell
+
+(shebang) @keyword.directive
+
+
+;; JSX
+
+(jsx_element
+  open_tag:
+    (jsx_opening_element
+      ["<" ">"] @tag.delimiter))
+
+(jsx_element
+  close_tag:
+    (jsx_closing_element
+      ["</" ">"] @tag.delimiter))
+
+(jsx_self_closing_element
+  ["<" "/>"] @tag.delimiter)
+
+(jsx_attribute
+  (property_identifier) @tag.attribute)
+
+(jsx_opening_element
+  name: (identifier) @tag.builtin)
+
+(jsx_closing_element
+  name: (identifier) @tag.builtin)
+
+(jsx_self_closing_element
+  name: (identifier) @tag.builtin)
+
+(jsx_opening_element
+  ((identifier) @tag
+    (#lua-match? @tag "^[A-Z]")))
+
+; ; Handle the dot operator effectively - <My.Component>
+; (jsx_opening_element
+;   (member_expression
+;     (identifier) @tag.builtin
+;     (property_identifier) @tag))
+
+(jsx_closing_element
+  ((identifier) @tag
+    (#lua-match? @tag "^[A-Z]")))
+
+; ; Handle the dot operator effectively - </My.Component>
+; (jsx_closing_element
+;   (member_expression
+;     (identifier) @tag.builtin
+;     (property_identifier) @tag))
+
+(jsx_self_closing_element
+  ((identifier) @tag
+    (#lua-match? @tag "^[A-Z]")))
+
+; ; Handle the dot operator effectively - <My.Component />
+; (jsx_self_closing_element
+;   (member_expression
+;     (identifier) @tag.builtin
+;     (property_identifier) @tag))
+
+; (html_character_reference) @tag
+; (html_character_reference) @character.special