diff --git a/xz-5.1.2alpha-man-page-day.patch b/xz-5.1.2alpha-man-page-day.patch
new file mode 100644
index 0000000..1d15a59
--- /dev/null
+++ b/xz-5.1.2alpha-man-page-day.patch
@@ -0,0 +1,81 @@
+diff --git a/src/xz/message.c b/src/xz/message.c
+index abbd171..ce953ac 100644
+--- a/src/xz/message.c
++++ b/src/xz/message.c
+@@ -1110,7 +1110,8 @@ message_help(bool long_help)
+ 
+ 	puts(_(
+ "  -z, --compress      force compression\n"
+-"  -d, --decompress    force decompression\n"
++"  -d, --decompress, --uncompress\n"
++"                      force decompression\n"
+ "  -t, --test          test compressed file integrity\n"
+ "  -l, --list          list information about .xz files"));
+ 
+@@ -1120,7 +1121,8 @@ message_help(bool long_help)
+ 	puts(_(
+ "  -k, --keep          keep (don't delete) input files\n"
+ "  -f, --force         force overwrite of output file and (de)compress links\n"
+-"  -c, --stdout        write to standard output and don't delete input files"));
++"  -c, --stdout, --to-stdout\n"
++"                      write to standard output and don't delete input files"));
+ 
+ 	if (long_help) {
+ 		puts(_(
+@@ -1152,6 +1154,10 @@ message_help(bool long_help)
+ "  -e, --extreme       try to improve compression ratio by using more CPU time;\n"
+ "                      does not affect decompressor memory requirements"));
+ 
++	puts(_(
++"  -T, --threads=NUM   use at most NUM threads; the default is 1; set to 0\n"
++"                      to use the number of processor cores"));
++
+ 	if (long_help) {
+ 		// FIXME? Mention something about threading?
+ 		puts(_(
+@@ -1166,7 +1172,7 @@ message_help(bool long_help)
+ 		puts(_( // xgettext:no-c-format
+ "      --memlimit-compress=LIMIT\n"
+ "      --memlimit-decompress=LIMIT\n"
+-"  -M, --memlimit=LIMIT\n"
++"  -M, --memlimit=LIMIT, (old alias --memory=LIMIT)\n"
+ "                      set memory usage limit for compression, decompression,\n"
+ "                      or both; LIMIT is in bytes, % of RAM, or 0 for defaults"));
+ 
+diff --git a/src/xz/xz.1 b/src/xz/xz.1
+index 0368f05..e5da140 100644
+--- a/src/xz/xz.1
++++ b/src/xz/xz.1
+@@ -912,7 +912,7 @@ See
+ for possible ways to specify the
+ .IR limit .
+ .TP
+-\fB\-M\fR \fIlimit\fR, \fB\-\-memlimit=\fIlimit\fR, \fB\-\-memory=\fIlimit
++\fB\-M\fR \fIlimit\fR, \fB\-\-memlimit=\fIlimit\fR, (old alias \fB\-\-memory=\fIlimit\fR)
+ This is equivalent to specifying \fB\-\-memlimit\-compress=\fIlimit
+ \fB\-\-memlimit\-decompress=\fIlimit\fR.
+ .TP
+diff --git a/src/xzdec/xzdec.c b/src/xzdec/xzdec.c
+index b7830db..48ac1fe 100644
+--- a/src/xzdec/xzdec.c
++++ b/src/xzdec/xzdec.c
+@@ -64,13 +64,15 @@ help(void)
+ "Usage: %s [OPTION]... [FILE]...\n"
+ "Uncompress files in the ." TOOL_FORMAT " format to the standard output.\n"
+ "\n"
+-"  -c, --stdout       (ignored)\n"
+-"  -d, --decompress   (ignored)\n"
+-"  -k, --keep         (ignored)\n"
+ "  -q, --quiet        specify *twice* to suppress errors\n"
+-"  -Q, --no-warn      (ignored)\n"
+ "  -h, --help         display this help and exit\n"
+ "  -V, --version      display the version number and exit\n"
++"  -c, --stdout, --to-stdout\n"
++"                     ignored, data are always written to standard output\n"
++"  -d, --decompress, --uncompress\n"
++"                     ignored, only decompression is supported\n"
++"  -k, --keep         ignored, we never create/remove any files\n"
++"  -Q, --no-warn      ignored, we never use exit status 2\n"
+ "\n"
+ "With no FILE, or when FILE is -, read standard input.\n"
+ "\n"
diff --git a/xz.spec b/xz.spec
index 026755c..ea6a8da 100644
--- a/xz.spec
+++ b/xz.spec
@@ -3,7 +3,7 @@
 Summary:	LZMA compression utilities
 Name:		xz
 Version:	5.1.2
-Release:	4alpha%{?dist}
+Release:	5alpha%{?dist}
 License:	LGPLv2+
 Group:		Applications/File
 # official upstream release
@@ -14,6 +14,11 @@ URL:		http://tukaani.org/%{name}/
 BuildRoot:	%{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 Requires:	%{name}-libs = %{version}-%{release}
 
+# partly upstream/partly not (yet?)
+# ~> proposal: http://www.mail-archive.com/xz-devel@tukaani.org/msg00153.html
+# ~> #948533
+Patch0:		xz-5.1.2alpha-man-page-day.patch
+
 %description
 XZ Utils are an attempt to make LZMA compression easy to use on free (as in
 freedom) operating systems. This is achieved by providing tools and libraries
@@ -66,6 +71,8 @@ commands that deal with the older LZMA format.
 
 %prep
 %setup -q -a1 -n %{name}-%{version}alpha
+%patch0  -p1 -b .man-page-day
+
 for i in `find . -name config.sub`; do
   perl -pi -e "s/ppc64-\*/ppc64-\* \| ppc64p7-\*/" $i
 done
@@ -138,6 +145,9 @@ rm -rf %{buildroot}
 %{_mandir}/man1/*lz*
 
 %changelog
+* Tue Apr 09 2013 Pavel Raiskup <praiskup@redhat.com> - 5.1.2-5alpha
+- fix manual page inconsistencies with help output (private #948533)
+
 * Thu Feb 21 2013 Karsten Hopp <karsten@redhat.com> 5.1.2-4alpha
 - add support for ppc64p7 arch (Power7 optimized)