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-rw-r--r--system/opensc/README8
1 files changed, 7 insertions, 1 deletions
diff --git a/system/opensc/README b/system/opensc/README
index 13c0f8fd6a..f4866279a6 100644
--- a/system/opensc/README
+++ b/system/opensc/README
@@ -15,4 +15,10 @@ Beware! Smartcards have usually a limited number of times you may try a
wrong PIN/PUK combination before they become inoperable/permanently
blocked. You have been warned!
-This requires pcsc-lite and openct.
+This requires either pcsc-lite or openct (see below for details).
+
+Since version 0.12.0, only one reader subsystem can be used and compiled
+in at the same time. The PCSC-LITE subsystem is used by default and it is
+suitable for most smartcards (it requires pcsc-lite). If you need the
+OPENCT subsystem instead, you have to pass "OPENCT=1" to the script when
+building and have openct installed.