diff --git a/cmd/ocitools/generate.go b/cmd/ocitools/generate.go
index 2efac6114..6dd4ec7f6 100644
--- a/cmd/ocitools/generate.go
+++ b/cmd/ocitools/generate.go
@@ -36,7 +36,7 @@ var generateFlags = []cli.Flag{
 	cli.StringFlag{Name: "mount-label", Usage: "selinux mount context label"},
 	cli.StringSliceFlag{Name: "tmpfs", Usage: "mount tmpfs"},
 	cli.StringSliceFlag{Name: "args", Usage: "command to run in the container"},
-	cli.StringSliceFlag{Name: "env", Usage: "add environment variable"},
+	cli.StringSliceFlag{Name: "env", Usage: "add environment variable e.g. key=value"},
 	cli.StringFlag{Name: "cgroups-path", Usage: "specify the path to the cgroups"},
 	cli.StringFlag{Name: "mount-cgroups", Value: "no", Usage: "mount cgroups (rw,ro,no)"},
 	cli.StringSliceFlag{Name: "bind", Usage: "bind mount directories src:dest:(rw,ro)"},
@@ -58,6 +58,7 @@ var generateFlags = []cli.Flag{
 	cli.StringSliceFlag{Name: "seccomp-errno", Usage: "specifies syscalls to be added to list that returns an error"},
 	cli.StringFlag{Name: "template", Usage: "base template to use for creating the configuration"},
 	cli.StringSliceFlag{Name: "label", Usage: "add annotations to the configuration e.g. key=value"},
+	cli.IntFlag{Name: "oom-score-adj", Usage: "oom_score_adj for the container"},
 }
 
 var generateCommand = cli.Command{
@@ -319,6 +320,10 @@ func setupSpec(g *generate.Generator, context *cli.Context) error {
 		g.AddLinuxGIDMapping(hid, cid, size)
 	}
 
+	if context.IsSet("oom-score-adj") {
+		g.SetLinuxResourcesOOMScoreAdj(context.Int("oom-score-adj"))
+	}
+
 	var sd string
 	var sa, ss []string
 
diff --git a/cmd/ocitools/validate.go b/cmd/ocitools/validate.go
index 0fab50202..6c37147a5 100644
--- a/cmd/ocitools/validate.go
+++ b/cmd/ocitools/validate.go
@@ -316,13 +316,7 @@ func checkLinux(spec rspec.Spec, rootfs string, hostCheck bool) (msgs []string)
 	ipcExists := false
 	mountExists := false
 	netExists := false
-
-	if len(spec.Linux.UIDMappings) > 5 {
-		msgs = append(msgs, "Only 5 UID mappings are allowed (linux kernel restriction).")
-	}
-	if len(spec.Linux.GIDMappings) > 5 {
-		msgs = append(msgs, "Only 5 GID mappings are allowed (linux kernel restriction).")
-	}
+	userExists := false
 
 	for index := 0; index < len(spec.Linux.Namespaces); index++ {
 		if !namespaceValid(spec.Linux.Namespaces[index]) {
@@ -336,10 +330,20 @@ func checkLinux(spec rspec.Spec, rootfs string, hostCheck bool) (msgs []string)
 				netExists = true
 			} else if spec.Linux.Namespaces[index].Type == rspec.MountNamespace {
 				mountExists = true
+			} else if spec.Linux.Namespaces[index].Type == rspec.UserNamespace {
+				userExists = true
 			}
 		}
 	}
 
+	if (len(spec.Linux.UIDMappings) > 0 || len(spec.Linux.GIDMappings) > 0) && !userExists {
+		msgs = append(msgs, "UID/GID mappings requires a new User namespace to be specified as well")
+	} else if len(spec.Linux.UIDMappings) > 5 {
+		msgs = append(msgs, "Only 5 UID mappings are allowed (linux kernel restriction).")
+	} else if len(spec.Linux.GIDMappings) > 5 {
+		msgs = append(msgs, "Only 5 GID mappings are allowed (linux kernel restriction).")
+	}
+
 	for k := range spec.Linux.Sysctl {
 		if strings.HasPrefix(k, "net.") && !netExists {
 			msgs = append(msgs, fmt.Sprintf("Sysctl %v requires a new Network namespace to be specified as well", k))
@@ -361,6 +365,11 @@ func checkLinux(spec rspec.Spec, rootfs string, hostCheck bool) (msgs []string)
 		}
 	}
 
+	if spec.Linux.Resources != nil {
+		ms := checkLinuxResources(*spec.Linux.Resources, hostCheck)
+		msgs = append(msgs, ms...)
+	}
+
 	if spec.Linux.Seccomp != nil {
 		ms := checkSeccomp(*spec.Linux.Seccomp)
 		msgs = append(msgs, ms...)
@@ -381,6 +390,21 @@ func checkLinux(spec rspec.Spec, rootfs string, hostCheck bool) (msgs []string)
 	return
 }
 
+func checkLinuxResources(r rspec.Resources, hostCheck bool) (msgs []string) {
+	logrus.Debugf("check linux resources")
+
+	if r.Memory != nil {
+		if r.Memory.Limit != nil && r.Memory.Swap != nil && uint64(*r.Memory.Limit) > uint64(*r.Memory.Swap) {
+			msgs = append(msgs, fmt.Sprintf("Minimum memoryswap should be larger than memory limit"))
+		}
+		if r.Memory.Limit != nil && r.Memory.Reservation != nil && uint64(*r.Memory.Reservation) > uint64(*r.Memory.Limit) {
+			msgs = append(msgs, fmt.Sprintf("Minimum memory limit should be larger than memory reservation"))
+		}
+	}
+
+	return
+}
+
 func checkSeccomp(s rspec.Seccomp) (msgs []string) {
 	logrus.Debugf("check seccomp")
 
diff --git a/completions/bash/ocitools b/completions/bash/ocitools
index 3328792d7..50233c71a 100644
--- a/completions/bash/ocitools
+++ b/completions/bash/ocitools
@@ -275,6 +275,7 @@ _ocitools_generate() {
 	      --cap-add
 	      --cap-drop
 	      --cgroup
+	      --cgroup-path
 	      --cwd
 	      --env
 	      --gid
@@ -283,25 +284,31 @@ _ocitools_generate() {
 	      --hostname
 	      --help
 	      --ipc
+	      --label
 	      --mount
 	      --mount-cgroups
+	      --mount-label
 	      --network
 	      --os
+	      --output
 	      --pid
 	      --poststart
 	      --poststop
 	      --prestart
 	      --root-propagation
 	      --rootfs
-	      --seccomp-default
+	      --seccomp-allow
 	      --seccomp-arch
+	      --seccomp-default
+	      --seccomp-errno
 	      --seccomp-syscalls
 	      --selinux-label
-	      --mount-label
 	      --sysctl
+	      --tmplate
 	      --tmpfs
 	      --uid
 	      --uidmappings
+	      --user
 	      --uts
 	"
 
@@ -330,11 +337,6 @@ _ocitools_generate() {
 			return
 			;;
 
-		--seccomp-default)
-			__ocitools_complete_seccomp_actions
-			return
-			;;
-
 		--root-propagation)
 			__ocitools_complete_propagations
 			return
diff --git a/generate/generate.go b/generate/generate.go
index bb3f880dc..a3d978572 100644
--- a/generate/generate.go
+++ b/generate/generate.go
@@ -194,11 +194,7 @@ func (g *Generator) Save(w io.Writer) error {
 	}
 
 	_, err = w.Write(data)
-	if err != nil {
-		return err
-	}
-
-	return nil
+	return err
 }
 
 // SaveToFile writes the spec into a file.
@@ -362,6 +358,12 @@ func (g *Generator) SetLinuxMountLabel(label string) {
 	g.spec.Linux.MountLabel = label
 }
 
+// SetLinuxResourcesOOMScoreAdj sets g.spec.Linux.Resources.OOMScoreAdj.
+func (g *Generator) SetLinuxResourcesOOMScoreAdj(adj int) {
+	g.initSpecLinuxResources()
+	g.spec.Linux.Resources.OOMScoreAdj = &adj
+}
+
 // SetLinuxResourcesCPUShares sets g.spec.Linux.Resources.CPU.Shares.
 func (g *Generator) SetLinuxResourcesCPUShares(shares uint64) {
 	g.initSpecLinuxResourcesCPU()
@@ -855,6 +857,7 @@ func (g *Generator) AddCgroupsMount(mountCgroupOption string) error {
 	switch mountCgroupOption {
 	case "ro":
 	case "rw":
+		break
 	case "no":
 		return nil
 	default:
diff --git a/man/ocitools-generate.1.md b/man/ocitools-generate.1.md
index 72bc764aa..a530a8e1a 100644
--- a/man/ocitools-generate.1.md
+++ b/man/ocitools-generate.1.md
@@ -58,10 +58,10 @@ read the configuration from `config.json`.
   Current working directory for the process
 
 **--env**=[]
-  Set environment variables
-  This option allows you to specify arbitrary
-environment variables that are available for the process that will be launched
-inside of the container.
+  Set environment variables e.g. key=value.
+  This option allows you to specify arbitrary environment variables
+  that are available for the process that will be launched inside of
+  the container.
 
 **--gid**=GID
   Gid for the process inside of container
@@ -84,6 +84,9 @@ inside of the container.
   The special *PATH* `host` removes any existing IPC namespace from the
   configuration.
 
+**--label**=[]
+  Add annotations to the configuration e.g. key=value.
+
 **--mount**=*PATH*
   Use a mount namespace where *PATH* is an existing mount namespace file
   to join. The special *PATH*  empty-string  creates a new namespace.
@@ -117,6 +120,9 @@ inside of the container.
   using tools like setuid apps.  It is a good idea to run unprivileged
   containers with this flag.
 
+**--oom-score-adj**=adj
+  Specifies oom_score_adj for the container.
+
 **--output**=PATH
   Instead of writing the configuration JSON to stdout, write it to a
   file at *PATH* (overwriting the existing content if a file already
diff --git a/man/ocitools.1.md b/man/ocitools.1.md
index a698fff4e..dbc790cd0 100644
--- a/man/ocitools.1.md
+++ b/man/ocitools.1.md
@@ -38,11 +38,11 @@ ocitools is a collection of tools for working with the [OCI runtime specificatio
 # COMMANDS
 **validate**
   Validating OCI bundle
-  See **ocitools-validate(1)** for full documentation on the **validate** command.
+  See **ocitools-validate**(1) for full documentation on the **validate** command.
 
 **generate**
   Generating OCI runtime spec configuration files
-  See **ocitools-generate(1)** for full documentation on the **generate** command.
+  See **ocitools-generate**(1) for full documentation on the **generate** command.
 
 # SEE ALSO
 **ocitools-validate**(1), **ocitools-generate**(1)