diff --git a/README.md b/README.md
index ecdd892..5e3c902 100644
--- a/README.md
+++ b/README.md
@@ -67,7 +67,7 @@ These are the types that can be used with BinaryReader. Just add `read_` or `wri
 uint8, int8,
 uint16, int16, half_float
 uint32, int32, float
-uint64, int64,
+uint64, int64, double
 bytes, str
 ```
 
diff --git a/binary_reader/binary_reader.py b/binary_reader/binary_reader.py
index de05b11..e819a87 100644
--- a/binary_reader/binary_reader.py
+++ b/binary_reader/binary_reader.py
@@ -15,7 +15,7 @@
     FMT[c] = 2
 for c in ["i", "I", "f"]:
     FMT[c] = 4
-for c in ["q", "Q"]:
+for c in ["q", "Q", "d"]:
     FMT[c] = 8
 
 
@@ -345,6 +345,14 @@ def read_uint8(self, count=None) -> Union[int, Tuple[int]]:
             return self.__read_type("B", count)
         return self.__read_type("B")[0]
 
+    def read_double(self, count=None) -> Union[float, Tuple[float]]:
+        """Reads a 64-bit float (double-precision).\n
+        If count is given, will return a tuple of values instead of 1 value.
+        """
+        if count is not None:
+            return self.__read_type("d", count)
+        return self.__read_type("d")[0]
+
     def read_float(self, count=None) -> Union[float, Tuple[float]]:
         """Reads a 32-bit float.\n
         If count is given, will return a tuple of values instead of 1 value.
@@ -479,6 +487,12 @@ def write_uint8(self, value: int) -> None:
         """
         self.__write_type("B", value, self.is_iterable(value))
 
+    def write_double(self, value: float) -> None:
+        """Writes a 64-bit float (double-precision).\n
+        If value is iterable, will write all of the elements in the given iterable.
+        """
+        self.__write_type("d", value, self.is_iterable(value))    
+
     def write_float(self, value: float) -> None:
         """Writes a 32-bit float.\n
         If value is iterable, will write all of the elements in the given iterable.