diff --git a/tests/Makefile b/tests/Makefile
index 063245b..aacdcba 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -1,6 +1,7 @@
 
 # To compile on SunOS: add "-lsocket -lnsl" to LDFLAGS
 # To compile on MinGW: add "-lws2_32" to LDFLAGS
+# To compile with PKCS11: add "-lpkcs11-helper" to LDFLAGS
 
 CFLAGS	= -I../include -D_FILE_OFFSET_BITS=64 -Wall -Wdeclaration-after-statement \
 			-Wno-unused-function -Wno-unused-value