diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index 883b988..0539553 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -2153,6 +2153,57 @@
 
 int mbedtls_ssl_tls13_check_early_data_len(mbedtls_ssl_context *ssl,
                                            size_t early_data_len);
+
+typedef enum {
+/*
+ * The client has not sent the first ClientHello yet, the negotiation of early
+ * data has not started yet.
+ */
+    MBEDTLS_SSL_EARLY_DATA_STATE_IDLE,
+
+/*
+ * In its ClientHello, the client has not included an early data indication
+ * extension.
+ */
+    MBEDTLS_SSL_EARLY_DATA_STATE_NO_IND_SENT,
+
+/*
+ * The client has sent an early data indication extension in its first
+ * ClientHello, it has not received the response (ServerHello or
+ * HelloRetryRequest) from the server yet. The transform to protect early data
+ * is not set either as for middlebox compatibility a dummy CCs may have to be
+ * sent in clear. Early data cannot be sent to the server yet.
+ */
+    MBEDTLS_SSL_EARLY_DATA_STATE_IND_SENT,
+
+/*
+ * The client has sent an early data indication extension in its first
+ * ClientHello, it has not received the response (ServerHello or
+ * HelloRetryRequest) from the server yet. The transform to protect early data
+ * has been set and early data can be written now.
+ */
+    MBEDTLS_SSL_EARLY_DATA_STATE_CAN_WRITE,
+
+/*
+ * The client has indicated the use of early data and the server has accepted
+ * it.
+ */
+    MBEDTLS_SSL_EARLY_DATA_STATE_ACCEPTED,
+
+/*
+ * The client has indicated the use of early data but the server has rejected
+ * it.
+ */
+    MBEDTLS_SSL_EARLY_DATA_STATE_REJECTED,
+
+/*
+ * The client has sent an early data indication extension in its first
+ * ClientHello, the server has accepted them and the client has received the
+ * server Finished message. It cannot send early data to the server anymore.
+ */
+    MBEDTLS_SSL_EARLY_DATA_STATE_SERVER_FINISHED_RECEIVED,
+
+} mbedtls_ssl_early_data_state;
 #endif /* MBEDTLS_SSL_EARLY_DATA */
 
 #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */