cmd/sgblog-comment-add/main.go |  2 +-
 cmd/sgblog-topics/main.go      |  2 +-
 cmd/sgblog/gemini.go           |  2 +-
 cmd/sgblog/gopher.go           |  2 +-
 cmd/sgblog/http.go             |  2 +-
 cmd/sgblog/topics.go           |  2 +-
 common.go => internal/note.go  | 47 +----------------------------------------------
 internal/comments.go           | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 internal/topics.go             | 33 +++++++++++++++++++++++++++++++++
 internal/version.go            |  3 +++
 internal/when.go               |  3 +++

diff --git a/cmd/sgblog-comment-add/main.go b/cmd/sgblog-comment-add/main.go
index 27d3c74f3af915af13a4e8109317881ed07a9fa93a59216b8776f9f5ca7d1ddc..d559b63eb6a3b7eebe40e5be56f8d8741740020a87168da6f77f679de5e9bda1 100644
--- a/cmd/sgblog-comment-add/main.go
+++ b/cmd/sgblog-comment-add/main.go
@@ -35,7 +35,7 @@ 	"syscall"
 	"time"
 
 	"go.cypherpunks.su/recfile/v3"
-	"go.stargrave.org/sgblog"
+	sgblog "go.stargrave.org/sgblog/internal"
 )
 
 var hashFinder = regexp.MustCompile("([0-9a-f]{40})")
diff --git a/cmd/sgblog-topics/main.go b/cmd/sgblog-topics/main.go
index 8674a4ecb9f84321e84ffda29268907df12a7ecc370e1e7684377e0d97018743..e0703d476984642fcf7a51a3d7668fe7aae33c7f64352e1343de41411ce49db1 100644
--- a/cmd/sgblog-topics/main.go
+++ b/cmd/sgblog-topics/main.go
@@ -26,7 +26,7 @@ 	"github.com/go-git/go-git/v5"
 	"github.com/go-git/go-git/v5/plumbing"
 	"github.com/go-git/go-git/v5/plumbing/object"
 	"github.com/go-git/go-git/v5/plumbing/storer"
-	"go.stargrave.org/sgblog"
+	sgblog "go.stargrave.org/sgblog/internal"
 )
 
 func main() {
diff --git a/cmd/sgblog/gemini.go b/cmd/sgblog/gemini.go
index 10a4334c24ebb696f087aaa8ae1bff30f9408bcd3e4f11db42d695747eff1ca4..0f77301115d7650260383f0614c799e9a5b04577aa2334467284d9a644a06cab 100644
--- a/cmd/sgblog/gemini.go
+++ b/cmd/sgblog/gemini.go
@@ -33,7 +33,7 @@ 	"github.com/go-git/go-git/v5"
 	"github.com/go-git/go-git/v5/plumbing"
 	"github.com/go-git/go-git/v5/plumbing/object"
 	"github.com/vorlif/spreak"
-	"go.stargrave.org/sgblog"
+	sgblog "go.stargrave.org/sgblog/internal"
 )
 
 var (
diff --git a/cmd/sgblog/gopher.go b/cmd/sgblog/gopher.go
index 5dcd996e92a7d22fb89fd650cec9c1c7b2b1685235df66662b1a3f30554452c1..1877625f5580d0b25455dc5c4fd8a994e47c6608fa86c00b4f7e6059b45546d3 100644
--- a/cmd/sgblog/gopher.go
+++ b/cmd/sgblog/gopher.go
@@ -31,7 +31,7 @@ 	"github.com/go-git/go-git/v5"
 	"github.com/go-git/go-git/v5/plumbing"
 	"github.com/go-git/go-git/v5/plumbing/object"
 	"github.com/vorlif/spreak"
-	"go.stargrave.org/sgblog"
+	sgblog "go.stargrave.org/sgblog/internal"
 )
 
 var (
diff --git a/cmd/sgblog/http.go b/cmd/sgblog/http.go
index 78e56745084080b6b314eabc06175d3f3db9cf9b245e81561bdfed9fe78a1ea4..8f3b3dcc7aa15c178e84bef3ebd54dc9999ff310c3f9b8a94f27361589cd6bf1 100644
--- a/cmd/sgblog/http.go
+++ b/cmd/sgblog/http.go
@@ -41,8 +41,8 @@ 	"github.com/go-git/go-git/v5/plumbing/object"
 	"github.com/go-git/go-git/v5/plumbing/storer"
 	"github.com/klauspost/compress/zstd"
 	"github.com/vorlif/spreak"
-	"go.stargrave.org/sgblog"
 	"go.stargrave.org/sgblog/cmd/sgblog/atom"
+	sgblog "go.stargrave.org/sgblog/internal"
 	"lukechampine.com/blake3"
 )
 
diff --git a/cmd/sgblog/topics.go b/cmd/sgblog/topics.go
index e665486286d7a7e5f50ccb5a0373dff1779e1964d9e3af6f5f3f7fa18a587785..2a62aeab1a5ee85ceabeaca5e63bbc4d1bc34bac64be5b79cdaaffec4b92ec90 100644
--- a/cmd/sgblog/topics.go
+++ b/cmd/sgblog/topics.go
@@ -25,7 +25,7 @@ 	"time"
 
 	"github.com/go-git/go-git/v5/plumbing"
 	"github.com/go-git/go-git/v5/plumbing/object"
-	"go.stargrave.org/sgblog"
+	sgblog "go.stargrave.org/sgblog/internal"
 )
 
 type TopicsCache map[string][]plumbing.Hash
diff --git a/common.go b/internal/note.go
rename from common.go
rename to internal/note.go
index f61a02bbca28ed40c33d375a48d6d356608048b2caaadc9d9166a9a5d8a95fd3..0f37fc614a980c813e7c5d272b9659130c74c9b0e4b243de8489204fc8508f15 100644
--- a/common.go
+++ b/internal/note.go
@@ -13,61 +13,16 @@ //
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-// SGBlog -- Git-backed CGI/UCSPI blogging/phlogging/gemlogging engine
-package sgblog
+package internal
 
 import (
 	"bytes"
-	"fmt"
 	"io"
-	"sort"
-	"text/scanner"
 
 	"github.com/go-git/go-git/v5"
 	"github.com/go-git/go-git/v5/plumbing"
 	"github.com/go-git/go-git/v5/plumbing/object"
-	"go.cypherpunks.su/recfile/v3"
-)
-
-const (
-	Version = "0.36.0"
-	WhenFmt = "2006-01-02 15:04:05Z07:00"
 )
-
-func ParseComments(data []byte) []string {
-	comments := []string{}
-	r := recfile.NewReader(bytes.NewReader(data))
-	for {
-		fields, err := r.Next()
-		if err != nil {
-			break
-		}
-		if len(fields) != 3 ||
-			fields[0].F != "From" ||
-			fields[1].F != "Date" ||
-			fields[2].F != "Body" {
-			continue
-		}
-		comments = append(comments, fmt.Sprintf(
-			"%s: %s\n%s: %s\n%s",
-			fields[0].F, fields[0].V,
-			fields[1].F, fields[1].V,
-			fields[2].V,
-		))
-	}
-	return comments
-}
-
-func ParseTopics(data []byte) []string {
-	var s scanner.Scanner
-	s.Init(bytes.NewBuffer(data))
-	topics := []string{}
-	for tok := s.Scan(); tok != scanner.EOF; tok = s.Scan() {
-		topics = append(topics, s.TokenText())
-	}
-	sort.Strings(topics)
-	return topics
-}
 
 func GetNote(repo *git.Repository, tree *object.Tree, what plumbing.Hash) []byte {
 	if tree == nil {
diff --git a/internal/comments.go b/internal/comments.go
new file mode 100644
index 0000000000000000000000000000000000000000..c43dcdf290053af9753a3ac3d13836618976419972c64f3c0dd921db47994206
--- /dev/null
+++ b/internal/comments.go
@@ -0,0 +1,47 @@
+// SGBlog -- Git-backed CGI/UCSPI blogging/phlogging/gemlogging engine
+// Copyright (C) 2020-2025 Sergey Matveev <stargrave@stargrave.org>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as
+// published by the Free Software Foundation, version 3 of the License.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package internal
+
+import (
+	"bytes"
+	"fmt"
+
+	"go.cypherpunks.su/recfile/v3"
+)
+
+func ParseComments(data []byte) []string {
+	comments := []string{}
+	r := recfile.NewReader(bytes.NewReader(data))
+	for {
+		fields, err := r.Next()
+		if err != nil {
+			break
+		}
+		if len(fields) != 3 ||
+			fields[0].F != "From" ||
+			fields[1].F != "Date" ||
+			fields[2].F != "Body" {
+			continue
+		}
+		comments = append(comments, fmt.Sprintf(
+			"%s: %s\n%s: %s\n%s",
+			fields[0].F, fields[0].V,
+			fields[1].F, fields[1].V,
+			fields[2].V,
+		))
+	}
+	return comments
+}
diff --git a/internal/topics.go b/internal/topics.go
new file mode 100644
index 0000000000000000000000000000000000000000..20c211c3fd687aaa851033a64c87f798f8f206b0ccd4301040df7bdb6d1befae
--- /dev/null
+++ b/internal/topics.go
@@ -0,0 +1,33 @@
+// SGBlog -- Git-backed CGI/UCSPI blogging/phlogging/gemlogging engine
+// Copyright (C) 2020-2025 Sergey Matveev <stargrave@stargrave.org>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as
+// published by the Free Software Foundation, version 3 of the License.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package internal
+
+import (
+	"bytes"
+	"sort"
+	"text/scanner"
+)
+
+func ParseTopics(data []byte) []string {
+	var s scanner.Scanner
+	s.Init(bytes.NewBuffer(data))
+	topics := []string{}
+	for tok := s.Scan(); tok != scanner.EOF; tok = s.Scan() {
+		topics = append(topics, s.TokenText())
+	}
+	sort.Strings(topics)
+	return topics
+}
diff --git a/internal/version.go b/internal/version.go
new file mode 100644
index 0000000000000000000000000000000000000000..94fcc5e55490a33c1356d13d16f44ae7aabf8dae7db72332ead3a7ffaf983ad4
--- /dev/null
+++ b/internal/version.go
@@ -0,0 +1,3 @@
+package internal
+
+const Version = "0.37.0"
diff --git a/internal/when.go b/internal/when.go
new file mode 100644
index 0000000000000000000000000000000000000000..f57151616d63a37a6450a8ed653e3b3bb319b5bc8d10ce5a6504436cfe7e64fe
--- /dev/null
+++ b/internal/when.go
@@ -0,0 +1,3 @@
+package internal
+
+const WhenFmt = "2006-01-02 15:04:05Z07:00"