diff --git a/README b/README
index 7cb2717b..f99f569d 100644
--- a/README
+++ b/README
@@ -43,6 +43,7 @@ Requirements for the C library:
  - libusb-1.0 >= 1.0.16 (optional, used by some drivers)
  - libftdi >= 0.16 or libftdi1 >= 1.0 (optional, used by some drivers)
  - libgpib (optional, used by some drivers)
+ - libieee1284 (optional, used by some drivers)
  - check >= 0.9.4 (optional, only needed to run unit tests)
  - doxygen (optional, only needed for the C API docs)
  - graphviz (optional, only needed for the C API docs)