Fix use of pem_read_buffer() in PK, DHM and X509
diff --git a/include/mbedtls/dhm.h b/include/mbedtls/dhm.h
index 4d16619..caa630d 100644
--- a/include/mbedtls/dhm.h
+++ b/include/mbedtls/dhm.h
@@ -269,11 +269,12 @@
#if defined(MBEDTLS_ASN1_PARSE_C)
/** \ingroup x509_module */
/**
- * \brief Parse DHM parameters
+ * \brief Parse DHM parameters in PEM or DER format
*
* \param dhm DHM context to be initialized
* \param dhmin input buffer
* \param dhminlen size of the buffer
+ * (including the terminating null byte for PEM data)
*
* \return 0 if successful, or a specific DHM or PEM error code
*/