diff --git a/example/basic/go.mod b/example/basic/go.mod
new file mode 100644
index 0000000..eff8025
--- /dev/null
+++ b/example/basic/go.mod
@@ -0,0 +1,7 @@
+module github.com/steambap/captcha/example/basic
+
+go 1.12
+
+replace github.com/steambap/captcha => ../../
+
+require github.com/steambap/captcha v0.0.0-00010101000000-000000000000
diff --git a/example/basic/go.sum b/example/basic/go.sum
new file mode 100644
index 0000000..edaba75
--- /dev/null
+++ b/example/basic/go.sum
@@ -0,0 +1,5 @@
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
+golang.org/x/image v0.0.0-20190507092727-e4e5bf290fec h1:arXJwtMuk5vqI1NHX0UTnNw977rYk5Sl4jQqHj+hun4=
+golang.org/x/image v0.0.0-20190507092727-e4e5bf290fec/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
diff --git a/example/load-font/go.mod b/example/load-font/go.mod
new file mode 100644
index 0000000..eccfc64
--- /dev/null
+++ b/example/load-font/go.mod
@@ -0,0 +1,10 @@
+module github.com/steambap/captcha/example/load-font
+
+go 1.12
+
+replace github.com/steambap/captcha => ../../
+
+require (
+	github.com/steambap/captcha v0.0.0-00010101000000-000000000000
+	golang.org/x/image v0.0.0-20190507092727-e4e5bf290fec
+)
diff --git a/example/load-font/go.sum b/example/load-font/go.sum
new file mode 100644
index 0000000..edaba75
--- /dev/null
+++ b/example/load-font/go.sum
@@ -0,0 +1,5 @@
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
+golang.org/x/image v0.0.0-20190507092727-e4e5bf290fec h1:arXJwtMuk5vqI1NHX0UTnNw977rYk5Sl4jQqHj+hun4=
+golang.org/x/image v0.0.0-20190507092727-e4e5bf290fec/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..9f2fb30
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,8 @@
+module github.com/steambap/captcha
+
+go 1.12
+
+require (
+	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0
+	golang.org/x/image v0.0.0-20190507092727-e4e5bf290fec
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..edaba75
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,5 @@
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
+golang.org/x/image v0.0.0-20190507092727-e4e5bf290fec h1:arXJwtMuk5vqI1NHX0UTnNw977rYk5Sl4jQqHj+hun4=
+golang.org/x/image v0.0.0-20190507092727-e4e5bf290fec/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=