Mention more explicitly that only CP-437 and UTF-8 are supported by libzip.

Addresses #212.
diff --git a/man/zip_dir_add.mdoc b/man/zip_dir_add.mdoc
index 023ace9..01e0a22 100644
--- a/man/zip_dir_add.mdoc
+++ b/man/zip_dir_add.mdoc
@@ -29,7 +29,7 @@
 .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 .\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd April 25, 2020
+.Dd September 20, 2020
 .Dt ZIP_DIR_ADD 3
 .Os
 .Sh NAME
@@ -62,6 +62,7 @@
 Guess encoding of
 .Ar name
 (default).
+(Only CP-437 and UTF-8 are recognized.)
 .It Dv ZIP_FL_ENC_UTF_8
 Interpret
 .Ar name
diff --git a/man/zip_file_add.mdoc b/man/zip_file_add.mdoc
index 4a3e3b0..746f5ad 100644
--- a/man/zip_file_add.mdoc
+++ b/man/zip_file_add.mdoc
@@ -29,7 +29,7 @@
 .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 .\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd December 18, 2017
+.Dd September 22, 2020
 .Dt ZIP_FILE_ADD 3
 .Os
 .Sh NAME
@@ -76,6 +76,7 @@
 Guess encoding of
 .Ar name
 (default).
+(Only CP-437 and UTF-8 are recognized.)
 .It Dv ZIP_FL_ENC_UTF_8
 Interpret
 .Ar name
diff --git a/man/zip_file_get_comment.mdoc b/man/zip_file_get_comment.mdoc
index 7243282..d40a489 100644
--- a/man/zip_file_get_comment.mdoc
+++ b/man/zip_file_get_comment.mdoc
@@ -29,7 +29,7 @@
 .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 .\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd December 18, 2017
+.Dd September 22, 2020
 .Dt ZIP_FILE_GET_COMMENT 3
 .Os
 .Sh NAME
@@ -77,6 +77,7 @@
 (Default.)
 Guess the encoding of the comment in the ZIP archive and convert it
 to UTF-8, if necessary.
+(Only CP-437 and UTF-8 are recognized.)
 .It Dv ZIP_FL_ENC_STRICT
 Follow the ZIP specification for file names and extend it to file
 comments, expecting them to be encoded in CP-437 in the ZIP archive
diff --git a/man/zip_file_rename.mdoc b/man/zip_file_rename.mdoc
index d1a23d1..8b98303 100644
--- a/man/zip_file_rename.mdoc
+++ b/man/zip_file_rename.mdoc
@@ -29,7 +29,7 @@
 .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 .\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd December 18, 2017
+.Dd September 22, 2020
 .Dt ZIP_FILE_RENAME 3
 .Os
 .Sh NAME
@@ -56,6 +56,7 @@
 Guess encoding of
 .Ar name
 (default).
+(Only CP-437 and UTF-8 are recognized.)
 .It Dv ZIP_FL_ENC_UTF_8
 Interpret
 .Ar name
diff --git a/man/zip_file_set_comment.mdoc b/man/zip_file_set_comment.mdoc
index 1e596cf..213e0cb 100644
--- a/man/zip_file_set_comment.mdoc
+++ b/man/zip_file_set_comment.mdoc
@@ -29,7 +29,7 @@
 .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 .\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd December 18, 2017
+.Dd September 22, 2020
 .Dt ZIP_FILE_SET_COMMENT 3
 .Os
 .Sh NAME
@@ -65,6 +65,7 @@
 Guess encoding of
 .Ar comment
 (default).
+(Only CP-437 and UTF-8 are recognized.)
 .It Dv ZIP_FL_ENC_UTF_8
 Interpret
 .Ar comment
diff --git a/man/zip_get_archive_comment.mdoc b/man/zip_get_archive_comment.mdoc
index ce9a01b..bfd5ae7 100644
--- a/man/zip_get_archive_comment.mdoc
+++ b/man/zip_get_archive_comment.mdoc
@@ -29,7 +29,7 @@
 .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 .\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd July 22, 2018
+.Dd September 22, 2020
 .Dt ZIP_GET_ARCHIVE_COMMENT 3
 .Os
 .Sh NAME
@@ -75,6 +75,7 @@
 (Default.)
 Guess the encoding of the archive comment in the ZIP archive and convert it
 to UTF-8, if necessary.
+(Only CP-437 and UTF-8 are recognized.)
 .It Dv ZIP_FL_ENC_STRICT
 Follow the ZIP specification for file names and extend it to the
 archive comment, thus also expecting it in CP-437 encoding.
diff --git a/man/zip_get_name.mdoc b/man/zip_get_name.mdoc
index 27084f4..0b086c7 100644
--- a/man/zip_get_name.mdoc
+++ b/man/zip_get_name.mdoc
@@ -29,7 +29,7 @@
 .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 .\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd December 18, 2017
+.Dd September 22, 2020
 .Dt ZIP_GET_NAME 3
 .Os
 .Sh NAME
@@ -71,6 +71,7 @@
 (Default.)
 Guess the encoding of the name in the ZIP archive and convert it
 to UTF-8, if necessary.
+(Only CP-437 and UTF-8 are recognized.)
 .It Dv ZIP_FL_ENC_STRICT
 Follow the ZIP specification and expect CP-437 encoded names in
 the ZIP archive (except if they are explicitly marked as UTF-8).
diff --git a/man/zip_name_locate.mdoc b/man/zip_name_locate.mdoc
index d16402d..04a586d 100644
--- a/man/zip_name_locate.mdoc
+++ b/man/zip_name_locate.mdoc
@@ -29,7 +29,7 @@
 .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 .\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd December 18, 2017
+.Dd September 22, 2020
 .Dt ZIP_NAME_LOCATE 3
 .Os
 .Sh NAME
@@ -74,6 +74,7 @@
 (Default.)
 Guess the encoding of the name in the ZIP archive and convert it
 to UTF-8, if necessary, before comparing.
+(Only CP-437 and UTF-8 are recognized.)
 .It Dv ZIP_FL_ENC_STRICT
 Follow the ZIP specification and expect CP-437 encoded names in
 the ZIP archive (except if they are explicitly marked as UTF-8).