diff --git a/library/error.c b/library/error.c
index 21be423..e78057b 100644
--- a/library/error.c
+++ b/library/error.c
@@ -640,6 +640,8 @@
         mbedtls_snprintf( buf, buflen, "NET - Failed to get an IP address for the given hostname" );
     if( use_ret == -(MBEDTLS_ERR_NET_BUFFER_TOO_SMALL) )
         mbedtls_snprintf( buf, buflen, "NET - Buffer is too small to hold the data" );
+    if( use_ret == -(MBEDTLS_ERR_NET_INVALID_CONTEXT) )
+        mbedtls_snprintf( buf, buflen, "NET - The context is invalid, eg because it was free()ed" );
 #endif /* MBEDTLS_NET_C */
 
 #if defined(MBEDTLS_OID_C)