diff --git a/src/libopensc/errors.c b/src/libopensc/errors.c
index 613a09bd..eb41ec56 100644
--- a/src/libopensc/errors.c
+++ b/src/libopensc/errors.c
@@ -40,6 +40,8 @@ const char *sc_strerror(int error)
 		"Message too long (keypad)",
 		"Timeout while waiting for event (card reader)",
 		"Unresponsive card (correctly inserted?)",
+		"Reader detached (hotplug device?)",
+		"Reader reattached (hotplug device?)",
 	};
 	const int rdr_base = -SC_ERROR_READER;
 	const char *card_errors[] = {
diff --git a/src/libopensc/errors.h b/src/libopensc/errors.h
index 9e18daa7..474d6fad 100644
--- a/src/libopensc/errors.h
+++ b/src/libopensc/errors.h
@@ -43,6 +43,8 @@ extern "C" {
 #define SC_ERROR_KEYPAD_MSG_TOO_LONG		-1111
 #define SC_ERROR_EVENT_TIMEOUT			-1112
 #define SC_ERROR_CARD_UNRESPONSIVE		-1113
+#define SC_ERROR_READER_DETACHED		-1114
+#define SC_ERROR_READER_REATTACHED		-1115
 
 /* Resulting from a card command or related to the card*/
 #define SC_ERROR_CARD_CMD_FAILED		-1200