diff --git a/doc/stub/global.lua b/doc/stub/global.lua
index c9eabf221..5d81da154 100644
--- a/doc/stub/global.lua
+++ b/doc/stub/global.lua
@@ -28,7 +28,7 @@ thread, not the whole program.
 > need to receive events while sleeping, consider using [timers][`os.startTimer`],
 > or the [parallel API][`parallel`].
 
-@tparam number time The number of seconds to sleep for, rounded up to the
+@tparam[opt=0] number time The number of seconds to sleep for, rounded up to the
 nearest multiple of 0.05.
 
 @see os.startTimer
@@ -37,6 +37,8 @@ nearest multiple of 0.05.
     print("Sleeping for three seconds")
     sleep(3)
     print("Done!")
+
+@changed 1.63 The `time` parameter is now optional.
 ]]
 function sleep(time) end
 
diff --git a/doc/stub/os.lua b/doc/stub/os.lua
index d48437409..db2fa297a 100644
--- a/doc/stub/os.lua
+++ b/doc/stub/os.lua
@@ -91,8 +91,8 @@ function pullEventRaw(filter) end
 
 --- Pauses execution for the specified number of seconds, alias of [`_G.sleep`].
 --
--- @tparam number time The number of seconds to sleep for, rounded up to the
--- nearest multiple of 0.05.
+-- @tparam[opt=0] number time The number of seconds to sleep for, rounded up to
+-- the nearest multiple of 0.05.
 function sleep(time) end
 
 --- Get the current CraftOS version (for example, `CraftOS 1.9`).
diff --git a/projects/core/src/main/resources/data/computercraft/lua/rom/help/changelog.md b/projects/core/src/main/resources/data/computercraft/lua/rom/help/changelog.md
index 44a46277a..bb76c8ab2 100644
--- a/projects/core/src/main/resources/data/computercraft/lua/rom/help/changelog.md
+++ b/projects/core/src/main/resources/data/computercraft/lua/rom/help/changelog.md
@@ -1434,6 +1434,7 @@ And several bug fixes:
 * Turtle label nameplates now only show when the Turtle is moused-over
 * The HTTP API is now enabled by default, and can be configured with a whitelist of permitted domains
 * `http.get()` and `http.post()` now accept parameters to control the request headers
+* `sleep()`, when invoked without a parameter, defaults to 0.
 * New fs function: `fs.getDir( path )`
 * Fixed some bugs