diff --git a/experimental/submission.go b/experimental/submission.go
index 5a86e15..48039df 100644
--- a/experimental/submission.go
+++ b/experimental/submission.go
@@ -61,25 +61,45 @@ func SubmitPackage(authKey string, metadata PackageSubmissionMetadata) (*Package
 	return &res, nil
 }
 
-func ValidateReadme(data []byte) (bool, error) {
+// Simply checks the input data is valid markdown and doesn't exceed the max size.
+//
+// To this method does NOT call the API but rather simulates what it would do, avoiding an unnecessary call.
+func ValidateReadme(data []byte) (valid bool, errs []error, err error) {
 	if !utf8.Valid(data) {
-		return false, errors.New("error parsing readme: file is not UTF-8 compatible")
+		Add(&errs, "error parsing readme: file is not UTF-8 compatible")
 	}
 
 	bom := []byte{0xEF, 0xBB, 0xBF}
 	if bytes.HasPrefix(data, bom) {
-		return false, fmt.Errorf("readme cannot begin with a UTF-8 BOM")
+		Add(&errs, "readme cannot begin with a UTF-8 BOM")
 	}
 
 	str := string(data)
 	if len(str) > MAX_MARKDOWN_SIZE {
-		return false, fmt.Errorf("readme is too large: max file size is 100kb")
+		Add(&errs, fmt.Sprintf("readme is too large: max file size is %v", util.PrettyByteSize(MAX_MARKDOWN_SIZE)))
 	}
 
-	return true, nil
+	return true, errs, nil
 }
 
-func ValidateManifest(author string, data []byte) (valid bool, errs []string, err error) {
+// Unmarshals the data into ManifestMetadata and checks all properties pass their requirements,
+// reporting any that fail to the resulting 'errs' variable. The last variable 'err' indicates whether
+// the unmarshal failed, before any properties are able to be checked.
+//
+// To this method does NOT call the API but rather simulates what it would do, avoiding an unnecessary call.
+//
+// # Example usage:
+//
+//	valid, errs, err := ValidateManifest("Owen3H", manifestData)
+//	if err != nil {
+//	  fmt.Println(err)
+//	  return
+//	}
+//
+//	if !valid {
+//	  fmt.Println(errs)
+//	}
+func ValidateManifest(author string, data []byte) (valid bool, errs []error, err error) {
 	var manifest ManifestMetadata
 
 	err = json.Unmarshal(data, &manifest)
@@ -168,11 +188,11 @@ func ValidateIcon(data []byte) (bool, error) {
 	return true, nil
 }
 
-func Add(arr *[]string, errStr string) {
-	*arr = append(*arr, errStr)
+func Add(arr *[]error, errStr string) {
+	*arr = append(*arr, errors.New(errStr))
 }
 
-func AddIfEmpty(arr *[]string, str *string, errStr string) bool {
+func AddIfEmpty(arr *[]error, str *string, errStr string) bool {
 	empty := *str == "" || str == nil
 	if empty {
 		Add(arr, errStr)
@@ -181,9 +201,11 @@ func AddIfEmpty(arr *[]string, str *string, errStr string) bool {
 	return empty
 }
 
-func AddIfInvalid(arr *[]string, str *string, errStr string) {
+func AddIfInvalid(arr *[]error, str *string, errStr string) bool {
 	matched, _ := regexp.MatchString(`^[a-zA-Z0-9_]+$`, *str)
 	if !matched {
 		Add(arr, errStr)
 	}
+
+	return matched
 }
diff --git a/tests/exp/submission_test.go b/tests/exp/submission_test.go
index 31c3f68..8d7fbd3 100644
--- a/tests/exp/submission_test.go
+++ b/tests/exp/submission_test.go
@@ -6,10 +6,10 @@ import (
 	"testing"
 
 	TSGO "github.com/the-egg-corp/thundergo/experimental"
-	"github.com/the-egg-corp/thundergo/util"
 )
 
 const iconPath = "../test-pkg/icon.png.jpg"
+const readmePath = "../test-pkg/README.md"
 const manifestPath = "../test-pkg/manifest.json"
 
 func TestValidateIcon(t *testing.T) {
@@ -25,13 +25,37 @@ func TestValidateIcon(t *testing.T) {
 		t.Fatal(err.Error())
 	}
 
-	util.PrettyPrint(valid)
+	fmt.Println(valid)
 }
 
-func TestValidateManifest(t *testing.T) {
+func TestValidateReadme(t *testing.T) {
 	t.Skip()
 
-	var errs []string
+	data, err := os.ReadFile(readmePath)
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	valid, errs, err := TSGO.ValidateReadme(data)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	fmt.Println("Valid: ", valid)
+
+	if len(errs) > 0 {
+		fmt.Println(errs)
+
+		if valid {
+			t.Fatal("errors were returned, but readme is still valid")
+		}
+
+		return
+	}
+}
+
+func TestValidateManifest(t *testing.T) {
+	t.Skip()
 
 	data, err := os.ReadFile(manifestPath)
 	if err != nil {
@@ -40,13 +64,13 @@ func TestValidateManifest(t *testing.T) {
 
 	valid, errs, err := TSGO.ValidateManifest("Owen3H", data)
 	if err != nil {
-		t.Fatal(err.Error())
+		t.Fatal(err)
 	}
 
 	fmt.Println("Valid: ", valid)
 
 	if len(errs) > 0 {
-		util.PrettyPrint(errs)
+		fmt.Println(errs)
 
 		if valid {
 			t.Fatal("errors were returned, but manifest is still valid")
diff --git a/util/funcs.go b/util/funcs.go
index 006e4c4..60e612f 100644
--- a/util/funcs.go
+++ b/util/funcs.go
@@ -1,6 +1,7 @@
 package util
 
 import (
+	"fmt"
 	"reflect"
 	"regexp"
 	"strings"
@@ -82,3 +83,19 @@ func CheckSemVer(version string) (bool, error) {
 
 	return lo.Ternary(err == nil, matched, false), lo.Ternary(err == nil, nil, err)
 }
+
+// Yoinked from: https://yourbasic.org/golang/formatting-byte-size-to-human-readable-format/
+func PrettyByteSize(amt int64) string {
+	const unit = 1000
+	if amt < unit {
+		return fmt.Sprintf("%d B", amt)
+	}
+
+	div, exp := int64(unit), 0
+	for n := amt / unit; n >= unit; n /= unit {
+		div *= unit
+		exp++
+	}
+
+	return fmt.Sprintf("%.0f %cB", float64(amt)/float64(div), "kMGTPE"[exp])
+}