diff --git a/README.rst b/README.rst
index e5b2308..466304c 100644
--- a/README.rst
+++ b/README.rst
@@ -7,12 +7,7 @@ Python library for Mode-S message decoding. Support Downlink Formats (DF) are:
 
    -  aircraft information that contains: ICAO address, position, altitude, velocity (ground speed), callsign, etc.
 
--  Mode-S Elementary Surveillance (ELS) (DF4 and DF5).
-
-   - DF4: Altitude
-   - DF5: Squawk code
-
--  Mode-S Enhanced Surveillance (EHS) (DF20 and DF21). Additional information in response to SSR interrogation, such as: true airspeed, indicated airspeed, mach number, wind, temperature, etc.
+-  Mode-S Comm-B replies - Additional information in response to SSR interrogation, such as: true airspeed, indicated airspeed, mach number, wind, temperature, etc.
 
    - DF20: Altitude
    - DF21: Squawk code