1 files changed, 5 insertions, 2 deletions

diff --git a/lib/md5.h b/lib/md5.h
index d89f819a97b..db031aac04c 100644
--- a/lib/md5.h
+++ b/lib/md5.h
@@ -122,8 +122,11 @@ extern void *__md5_buffer (const char *buffer, size_t len,
                            void *resblock) __THROW;
 
 # endif
-/* Compute MD5 message digest for bytes read from STREAM.  The
-   resulting message digest number will be written into the 16 bytes
+/* Compute MD5 message digest for bytes read from STREAM.
+   STREAM is an open file stream.  Regular files are handled more efficiently.
+   The contents of STREAM from its current position to its end will be read.
+   The case that the last operation on STREAM was an 'ungetc' is not supported.
+   The resulting message digest number will be written into the 16 bytes
    beginning at RESBLOCK.  */
 extern int __md5_stream (FILE *stream, void *resblock) __THROW;