tpm2-tss: a slightly better README

diff --git a/tpm2-tss/README b/tpm2-tss/README
index ad6518a2644b468ee5f03f02aff999633c694c25..5acc1dcc265c846c3771b152bfc547825109fd8c 100644 (file)
--- a/tpm2-tss/README
+++ b/tpm2-tss/README
@@ -1,5 +1,14 @@
 OSS implementation of the TCG TPM2 Software Stack (TSS2).
 
+TPM2.0 TSS (Software Stack) consists of API layers provided to support
+TPM 2.0 chips. It is made out of three layers:
+
+- Enhanced System API (ESAPI)
+- System API (SAPI), which implements the system layer API;
+- Marshaling/Unmarshaling (MU)
+- TPM Command Transmission Interface (TCTI), which is used by SAPI to
+  allow communication with the TAB/RM layer;
+
 Before building tpm2-tss, please create a "tss" user and group:
 
   # groupadd -g 374 tss