diff --git a/include/mbedtls/ecp.h b/include/mbedtls/ecp.h
index 944b7f8..f821690 100644
--- a/include/mbedtls/ecp.h
+++ b/include/mbedtls/ecp.h
@@ -36,6 +36,7 @@
 #define MBEDTLS_ERR_ECP_RANDOM_FAILED                     -0x4D00  /**< Generation of random value, such as (ephemeral) key, failed. */
 #define MBEDTLS_ERR_ECP_INVALID_KEY                       -0x4C80  /**< Invalid private or public key. */
 #define MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH                  -0x4C00  /**< Signature is valid but shorter than the user-supplied length. */
+#define MBEDTLS_ERR_ECP_IN_PROGRESS                       -0x4B80  /**< Operation in progress, try again with the same parameters. */
 
 #if !defined(MBEDTLS_ECP_ALT)
 /*
diff --git a/include/mbedtls/error.h b/include/mbedtls/error.h
index 31591e2..6c58067 100644
--- a/include/mbedtls/error.h
+++ b/include/mbedtls/error.h
@@ -76,7 +76,7 @@
  * DHM       3   9
  * PK        3   14 (Started from top)
  * RSA       4   9
- * ECP       4   8 (Started from top)
+ * ECP       4   9 (Started from top)
  * MD        5   4
  * CIPHER    6   6
  * SSL       6   17 (Started from top)