diff --git a/README b/README
index 7aeab62..0a5f459 100644
--- a/README
+++ b/README
@@ -27,5 +27,5 @@ Dependencies
 Specifications
 --------------
 
-   -  Exif Version 2.3
+   -  Exif Version 2.31
    -  TIFF Revision 6.0
diff --git a/src/tag.rs b/src/tag.rs
index 2a5bdc1..348f7f3 100644
--- a/src/tag.rs
+++ b/src/tag.rs
@@ -210,6 +210,9 @@ generate_well_known_tag_constants!(
     (ExifVersion, 0x9000, "Exif version"),
     (DateTimeOriginal, 0x9003, "Date and time of original data generation"),
     (DateTimeDigitized, 0x9004, "Date and time of digital data generation"),
+    (OffsetTime, 0x9010, "Offset data of DateTime"),
+    (OffsetTimeOriginal, 0x9011, "Offset data of DateTimeOriginal"),
+    (OffsetTimeDigitized, 0x9012, "Offset data of DateTimeDigitized"),
     (ComponentsConfiguration, 0x9101, "Meaning of each component"),
     (CompressedBitsPerPixel, 0x9102, "Image compression mode"),
     (ShutterSpeedValue, 0x9201, "Shutter speed"),
@@ -228,6 +231,12 @@ generate_well_known_tag_constants!(
     (SubSecTime, 0x9290, "DateTime subseconds"),
     (SubSecTimeOriginal, 0x9291, "DateTimeOriginal subseconds"),
     (SubSecTimeDigitized, 0x9292, "DateTimeDigitized subseconds"),
+    (Temperature, 0x9400, "Temperature"),
+    (Humidity, 0x9401, "Humidity"),
+    (Pressure, 0x9402, "Pressure"),
+    (WaterDepth, 0x9403, "Water depth"),
+    (Acceleration, 0x9404, "Acceleration"),
+    (CameraElevationAngle, 0x9405, "Camera elevation angle"),
     (FlashpixVersion, 0xa000, "Supported Flashpix version"),
     (ColorSpace, 0xa001, "Color space information"),
     (PixelXDimension, 0xa002, "Valid image width"),