diff --git a/internal/funcs/generated/README.md b/internal/funcs/generated/README.md
index d1fbb979..35e0f212 100644
--- a/internal/funcs/generated/README.md
+++ b/internal/funcs/generated/README.md
@@ -4,7 +4,12 @@ This package can generate function signature files for Terraform >= 1.4 automati
 
 It is intended to run whenever HashiCorp releases a new Terraform version. If the Terraform version contains updated function signatures, it generates a new file for that version. When no changes are detected, one should commit the version bump in `gen/gen.go`.
 
-It may only work with full releases and will likely fail for pre-releases or versions containing metadata.
+Pre-releases are accepted with the following caveats:
+
+ - The given pre-release version of Terraform is downloaded
+ - The pre-release part of the version is omitted in all other contexts (e.g. function name, file name, constraint etc.)
+
+... meaning that e.g. `1.5.0-alpha20230504` downloads Terraform `1.5.0-alpha20230504` but assumes compatibility with `1.5.0`. Therefore, generating signatures based on pre-releases should be used with the assumption that those signatures won't change before the final release.
 
 ## Running
 
diff --git a/internal/funcs/generated/gen/gen.go b/internal/funcs/generated/gen/gen.go
index 2cdd07ac..4bb53c3f 100644
--- a/internal/funcs/generated/gen/gen.go
+++ b/internal/funcs/generated/gen/gen.go
@@ -26,8 +26,11 @@ import (
 	tfjson "github.com/hashicorp/terraform-json"
 )
 
+var (
+	terraformVersion = version.Must(version.NewVersion("1.4.0"))
+)
+
 const (
-	terraformVersion      = "1.4.0"
 	functionSignatureHash = "8877af98abc453ce29d43e390c71b97bceaf90563ed28cf575e0100288602e9d"
 )
 
@@ -47,7 +50,7 @@ func main() {
 		return
 	}
 	log.Printf("generating new signatures for %q\n", newSignatureHash)
-	functionsFile := fmt.Sprintf("%s.go", terraformVersion)
+	functionsFile := fmt.Sprintf("%s.go", terraformVersion.Core().String())
 	err = writeFunctions(functionsFile, functions)
 	if err != nil {
 		log.Fatal(err)
@@ -79,7 +82,7 @@ func signaturesFromTerraform(ctx context.Context) (*tfjson.MetadataFunctions, er
 		&releases.ExactVersion{
 			Product:    product.Terraform,
 			InstallDir: installDir,
-			Version:    version.Must(version.NewVersion(terraformVersion)),
+			Version:    terraformVersion,
 		},
 	})
 	if err != nil {
@@ -171,7 +174,7 @@ func {{ .FunctionName }}() map[string]schema.FunctionSignature {
 
 	var buf bytes.Buffer
 	err = tpl.Execute(&buf, data{
-		FunctionName: fmt.Sprintf("v%s_Functions", escapeVersion(terraformVersion)),
+		FunctionName: fmt.Sprintf("v%s_Functions", escapeVersion(terraformVersion.Core().String())),
 		Signatures:   functions.Signatures,
 	})
 	if err != nil {