doc: RPM instructions correction

Signed-off-by: John Spray <john.spray@inktank.com>

diff --git a/doc/install/build-ceph.rst b/doc/install/build-ceph.rst
index 3a9271989718b5739ea3e3bdeee44f31429ecb01..af7c9fc055a97c954126989181a60de8d84642b9 100644 (file)
--- a/doc/install/build-ceph.rst
+++ b/doc/install/build-ceph.rst
@@ -176,7 +176,7 @@ Or from the EU mirror::
 
 Extract the specfile::
 
-    tar --strip-components=1 --no-anchored -xvf ~/rpmbuild/SOURCES/ceph-<version>.tar.gz "ceph.spec" -C ~/rpmbuild/SPECS/
+    tar --strip-components=1 -C ~/rpmbuild/SPECS/ --no-anchored -xvjf ~/rpmbuild/SOURCES/ceph-<version>.tar.bz2 "ceph.spec"
 
 Build the RPM packages::