diff --git a/include/mbedtls/sha512.h b/include/mbedtls/sha512.h
index 0fbdb3b..7cba3f6 100644
--- a/include/mbedtls/sha512.h
+++ b/include/mbedtls/sha512.h
@@ -94,7 +94,7 @@
  * \brief          SHA-512 process buffer
  *
  * \param ctx      SHA-512 context
- * \param input    buffer holding the  data
+ * \param input    buffer holding the data
  * \param ilen     length of the input data
  *
  * \return         0 if successful
@@ -152,7 +152,7 @@
  * \deprecated     Superseded by mbedtls_sha512_update_ext() in 2.5.0
  *
  * \param ctx      SHA-512 context
- * \param input    buffer holding the  data
+ * \param input    buffer holding the data
  * \param ilen     length of the input data
  */
 MBEDTLS_DEPRECATED static inline void mbedtls_sha512_update(
@@ -211,7 +211,7 @@
 /**
  * \brief          Output = SHA-512( input buffer )
  *
- * \param input    buffer holding the  data
+ * \param input    buffer holding the data
  * \param ilen     length of the input data
  * \param output   SHA-384/512 checksum result
  * \param is384    0 = use SHA512, 1 = use SHA384
@@ -234,7 +234,7 @@
  *
  * \deprecated     Superseded by mbedtls_sha512_ext() in 2.5.0
  *
- * \param input    buffer holding the  data
+ * \param input    buffer holding the data
  * \param ilen     length of the input data
  * \param output   SHA-384/512 checksum result
  * \param is384    0 = use SHA512, 1 = use SHA384