diff --git a/include/polarssl/dhm.h b/include/polarssl/dhm.h
index ad0795f..4206b88 100644
--- a/include/polarssl/dhm.h
+++ b/include/polarssl/dhm.h
@@ -29,6 +29,9 @@
 
 #include "polarssl/bignum.h"
 
+/*
+ * DHM Error codes
+ */
 #define POLARSSL_ERR_DHM_BAD_INPUT_DATA                    0x0480
 #define POLARSSL_ERR_DHM_READ_PARAMS_FAILED                0x0490
 #define POLARSSL_ERR_DHM_MAKE_PARAMS_FAILED                0x04A0
@@ -36,6 +39,9 @@
 #define POLARSSL_ERR_DHM_MAKE_PUBLIC_FAILED                0x04C0
 #define POLARSSL_ERR_DHM_CALC_SECRET_FAILED                0x04D0
 
+/**
+ * \brief          DHM context structure
+ */
 typedef struct
 {
     int len;    /*!<  size(P) in chars  */