diff --git a/ed25519.lua b/ed25519.lua
index bf4fe4b..8eeff93 100644
--- a/ed25519.lua
+++ b/ed25519.lua
@@ -4,11 +4,11 @@
 --
 
 local expect = require "cc.expect".expect
-local fp =     require "ccryptolib.fp"
-local fq =     require "ccryptolib.fq"
-local sha512 = require "ccryptolib.sha512"
+local fp =     require "ccryptolib.internal.fp"
+local fq =     require "ccryptolib.internal.fq"
+local sha512 = require "ccryptolib.internal.sha512"
+local util =   require "ccryptolib.internal.util"
 local random = require "ccryptolib.random"
-local util =   require "ccryptolib.util"
 
 local unpack = unpack or table.unpack
 
diff --git a/fp.lua b/internal/fp.lua
similarity index 100%
rename from fp.lua
rename to internal/fp.lua
diff --git a/fq.lua b/internal/fq.lua
similarity index 99%
rename from fq.lua
rename to internal/fq.lua
index bc90c08..bd65d3a 100644
--- a/fq.lua
+++ b/internal/fq.lua
@@ -1,6 +1,6 @@
 --- Arithmetic on Curve25519's scalar field.
 --
--- @module ccryptolib.fq
+-- @module ccryptolib.internal.fq
 --
 
 local util = require "ccryptolib.util"
diff --git a/sha512.lua b/internal/sha512.lua
similarity index 99%
rename from sha512.lua
rename to internal/sha512.lua
index 461b064..28c5c5a 100644
--- a/sha512.lua
+++ b/internal/sha512.lua
@@ -1,6 +1,6 @@
 --- The SHA512 cryptographic hash function.
 --
--- @module sha512
+-- @module ccryptolib.internal.sha512
 --
 
 local expect = require "cc.expect".expect
diff --git a/util.lua b/internal/util.lua
similarity index 100%
rename from util.lua
rename to internal/util.lua