diff --git a/tsk3/fs/tsk_fs.h b/tsk3/fs/tsk_fs.h
index c966f7d561d5e6f56c0671f0067ed0cc31655ef8..31ae6187130fbb5d8f8b1d824901543f2d862596 100644
--- a/tsk3/fs/tsk_fs.h
+++ b/tsk3/fs/tsk_fs.h
@@ -847,7 +847,7 @@ extern "C" {
          uint8_t(*istat) (TSK_FS_INFO * fs, FILE * hFile, TSK_INUM_T inum,
             TSK_DADDR_T numblock, int32_t sec_skew);
 
-         TSK_RETVAL_ENUM(*dir_open_meta) (TSK_FS_INFO * fs, TSK_FS_DIR ** a_fs_dir, TSK_INUM_T inode);  ///< FS-specific function: Call tsk_fs_dir_open_meta() instead. 
+         TSK_RETVAL_ENUM(*dir_open_meta) (TSK_FS_INFO * fs, TSK_FS_DIR ** a_fs_dir, TSK_INUM_T inode);  ///< \internal Call tsk_fs_dir_open_meta() instead. 
 
          uint8_t(*jopen) (TSK_FS_INFO *, TSK_INUM_T);   ///< \internal
 
diff --git a/tsk3/img/tsk_img.h b/tsk3/img/tsk_img.h
index 07d488b2b71427aad7e62a2f636b0084a666c998..ae76e2bd2d9c952473b7b53c45da3bf17fe7b223 100644
--- a/tsk3/img/tsk_img.h
+++ b/tsk3/img/tsk_img.h
@@ -85,8 +85,8 @@ extern "C" {
         int cache_age[TSK_IMG_INFO_CACHE_NUM];  ///< "Age" of corresponding cache entry, higher means more recently used
         size_t cache_len[TSK_IMG_INFO_CACHE_NUM];       ///< Length of cache entry used (0 if never used)
 
-         ssize_t(*read) (TSK_IMG_INFO * img, TSK_OFF_T off, char *buf, size_t len);     ///< Pointer to file type specific read function
-        void (*close) (TSK_IMG_INFO *); ///< Pointer to file type specific close function
+         ssize_t(*read) (TSK_IMG_INFO * img, TSK_OFF_T off, char *buf, size_t len);     ///< \internal External progs should call tsk_img_read() 
+        void (*close) (TSK_IMG_INFO *); ///< \internal Progs should call tsk_img_close()
         void (*imgstat) (TSK_IMG_INFO *, FILE *);       ///< Pointer to file type specific function
     };
 
diff --git a/tsk3/vs/tsk_vs.h b/tsk3/vs/tsk_vs.h
index fccb879e56bcb44f5575bfdc6a995ba176864fa3..5ccf550fc33c3ad5d8ee466719677f83ee16b066 100644
--- a/tsk3/vs/tsk_vs.h
+++ b/tsk3/vs/tsk_vs.h
@@ -71,7 +71,7 @@ extern "C" {
 
         TSK_PNUM_T part_count;  ///< number of partitions 
 
-        void (*close) (TSK_VS_INFO *);
+        void (*close) (TSK_VS_INFO *); ///< \internal Progs should call tsk_vs_close().
     };