diff --git a/INSTALL b/INSTALL
index 02e0429e3..121572022 100644
--- a/INSTALL
+++ b/INSTALL
@@ -43,12 +43,13 @@ the  libfftw library  development  package.   Normally installing  the
 library  development  package  pulls  in all  the  FFTW  v3  libraries
 including the single precision variant.
 
-The Hamlib  library optionally  requires the libusb-1.0-1  library, if
-the development  version (libusb-1.0-0-dev)  is available  Hamlib will
-configure its  custom USB device  back end  drivers. Most rigs  do not
-require this so normally you  can choose not to install libusb-1.0-dev
-but if you have  a SoftRock USB or similar SDR that  uses a custom USB
-interface then it is required.
+The  Hamlib  library requires  the  readline  development package  and
+optionally  requires  the  libusb-1.0-1 library,  if  the  development
+version  (libusb-1.0-0-dev) is  available  Hamlib  will configure  its
+custom USB device  back end drivers. Most rigs do  not require this so
+normally you can choose not to  install libusb-1.0-dev but if you have
+a SoftRock USB or similar SDR that uses a custom USB interface then it
+is required.
 
 The Hamlib  library is  required. Currently WSJT-X  needs to  be built
 using a  forked version of the  Hamlib git master. This  fork contains