diff --git a/cmd/substreams/pack.go b/cmd/substreams/pack.go
index 14964b036..30b8e957a 100644
--- a/cmd/substreams/pack.go
+++ b/cmd/substreams/pack.go
@@ -43,21 +43,21 @@ func runPack(cmd *cobra.Command, args []string) error {
 		return fmt.Errorf("writing %q: %w", defaultFilename, err)
 	}
 
-	fmt.Printf(`To generate bindings for your Rust code:
+	fmt.Printf(`To generate bindings for your code:
 1. create a file 'buf.gen.yaml' with this content:
 
 version: v1
 plugins:
-  - name: prost
+  - name: prost  # Generate for Rust, used by your modules, or Rust client code.
     out: gen/src
     opt:
       - bytes=.
       - compile_well_known_types
-2. run 'buf generate %s#format=bin'
 
+2. run 'buf generate %s#format=bin'
 3. See https://crates.io/crates/protoc-gen-prost for more details
+
 `, defaultFilename)
-	fmt.Println("")
 	fmt.Printf("----------------------------------------\n")
 	fmt.Printf("Successfully wrote %q.\n", defaultFilename)
 
diff --git a/go.mod b/go.mod
index 2ec24a05a..b2c2a3fe3 100644
--- a/go.mod
+++ b/go.mod
@@ -105,6 +105,7 @@ require (
 	go.uber.org/atomic v1.9.0 // indirect
 	go.uber.org/multierr v1.6.0 // indirect
 	golang.org/x/crypto v0.0.0-20220214200702-86341886e292 // indirect
+	golang.org/x/mod v0.5.1 // indirect
 	golang.org/x/net v0.0.0-20220225172249-27dd8689420f // indirect
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
 	golang.org/x/sys v0.0.0-20220209214540-3681064d5158 // indirect
diff --git a/go.sum b/go.sum
index 18df5a356..3ace44503 100644
--- a/go.sum
+++ b/go.sum
@@ -709,6 +709,8 @@ golang.org/x/mod v0.4.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.1/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.5.0/go.mod h1:5OXOZSfqPIIbmVBIIKWRFfZjPR0E5r58TLhUjH0a2Ro=
+golang.org/x/mod v0.5.1 h1:OJxoQ/rynoF0dcCdI7cLPktw/hR2cueqYfjm43oqK38=
+golang.org/x/mod v0.5.1/go.mod h1:5OXOZSfqPIIbmVBIIKWRFfZjPR0E5r58TLhUjH0a2Ro=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
diff --git a/manifest/package.go b/manifest/package.go
index 173c05552..eb0bcdc83 100644
--- a/manifest/package.go
+++ b/manifest/package.go
@@ -7,6 +7,7 @@ import (
 	"strings"
 
 	pbsubstreams "github.com/streamingfast/substreams/pb/sf/substreams/v1"
+	"golang.org/x/mod/semver"
 	"google.golang.org/protobuf/proto"
 )
 
@@ -191,7 +192,10 @@ func validatePackage(pkg *pbsubstreams.Package) error {
 
 	for _, spkg := range pkg.PackageMeta {
 		if !moduleNameRegexp.MatchString(spkg.Name) {
-			return fmt.Errorf("invalid package name %q: must match %s", spkg.Name, moduleNameRegexp.String())
+			return fmt.Errorf("package %q: invalid name: must match %s", spkg.Name, moduleNameRegexp.String())
+		}
+		if !semver.IsValid(spkg.Version) {
+			return fmt.Errorf("package %q: version %q should match Semver", spkg.Name, spkg.Version)
 		}
 	}