diff --git a/docs/Manifest.toml b/docs/Manifest.toml
index 6a5c6ca2..3070d741 100644
--- a/docs/Manifest.toml
+++ b/docs/Manifest.toml
@@ -27,6 +27,12 @@ git-tree-sha1 = "055eb2690182ebc31087859c3dd8598371d3ef9e"
 uuid = "b99e7846-7c00-51b0-8f62-c81ae34c0232"
 version = "0.5.3"
 
+[[CSTParser]]
+deps = ["LibGit2", "Test", "Tokenize"]
+git-tree-sha1 = "437c93bc191cd55957b3f8dee7794b6131997c56"
+uuid = "00ebfdb7-1f24-5e51-bd34-a7502290713f"
+version = "0.5.2"
+
 [[CodecZlib]]
 deps = ["BinaryProvider", "Libdl", "Test", "TranscodingStreams"]
 git-tree-sha1 = "36bbf5374c661054d41410dc53ff752972583b9b"
@@ -53,9 +59,9 @@ version = "0.2.0"
 
 [[Compat]]
 deps = ["Base64", "Dates", "DelimitedFiles", "Distributed", "InteractiveUtils", "LibGit2", "Libdl", "LinearAlgebra", "Markdown", "Mmap", "Pkg", "Printf", "REPL", "Random", "Serialization", "SharedArrays", "Sockets", "SparseArrays", "Statistics", "Test", "UUIDs", "Unicode"]
-git-tree-sha1 = "195a3ffcb8b0762684b6821de18f83a16455c6ea"
+git-tree-sha1 = "84aa74986c5b9b898b0d1acaf3258741ee64754f"
 uuid = "34da2185-b29b-5c13-b0c7-acf172513d20"
-version = "2.0.0"
+version = "2.1.0"
 
 [[DataStructures]]
 deps = ["InteractiveUtils", "OrderedCollections", "Random", "Serialization", "Test"]
@@ -89,9 +95,9 @@ uuid = "8ba89e20-285c-5b6f-9357-94700520ee1b"
 
 [[DocStringExtensions]]
 deps = ["LibGit2", "Markdown", "Pkg", "Test"]
-git-tree-sha1 = "1df01539a1c952cef21f2d2d1c092c2bcf0177d7"
+git-tree-sha1 = "4d30e889c9f106a51ffa4791a88ffd4765bf20c3"
 uuid = "ffbed154-4ef7-542d-bbb7-c09d3a79fcae"
-version = "0.6.0"
+version = "0.7.0"
 
 [[Documenter]]
 deps = ["Base64", "DocStringExtensions", "InteractiveUtils", "LibGit2", "Logging", "Markdown", "Pkg", "REPL", "Random", "Test", "Unicode"]
@@ -106,10 +112,10 @@ uuid = "53c48c17-4a7d-5ca2-90c5-79b7896eea93"
 version = "0.5.3"
 
 [[Flux]]
-deps = ["AbstractTrees", "Adapt", "CodecZlib", "Colors", "Juno", "LinearAlgebra", "MacroTools", "NNlib", "Pkg", "Printf", "Random", "Reexport", "Requires", "SHA", "Statistics", "StatsBase", "Test", "Tracker", "ZipFile"]
+deps = ["AbstractTrees", "Adapt", "CodecZlib", "Colors", "DelimitedFiles", "Juno", "LinearAlgebra", "MacroTools", "NNlib", "Pkg", "Printf", "Random", "Reexport", "Requires", "SHA", "Statistics", "StatsBase", "Tracker", "ZipFile"]
 path = ".."
 uuid = "587475ba-b771-5e3f-ad9e-33799f191a9c"
-version = "0.7.3+"
+version = "0.8.2+"
 
 [[ForwardDiff]]
 deps = ["CommonSubexpressions", "DiffResults", "DiffRules", "InteractiveUtils", "LinearAlgebra", "NaNMath", "Random", "SparseArrays", "SpecialFunctions", "StaticArrays", "Test"]
@@ -123,9 +129,9 @@ uuid = "b77e0a4c-d291-57a0-90e8-8db25a27a240"
 
 [[Juno]]
 deps = ["Base64", "Logging", "Media", "Profile", "Test"]
-git-tree-sha1 = "ce6246e19061e36cbdce954caaae717498daeed8"
+git-tree-sha1 = "4e4a8d43aa7ecec66cadaf311fbd1e5c9d7b9175"
 uuid = "e5e0dc1b-0480-54bc-9374-aad01c23163d"
-version = "0.5.4"
+version = "0.7.0"
 
 [[LibGit2]]
 uuid = "76f85450-5226-5b5a-8eaa-529ad045b433"
@@ -141,10 +147,10 @@ uuid = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 uuid = "56ddb016-857b-54e1-b83d-db4d58db5568"
 
 [[MacroTools]]
-deps = ["Compat"]
-git-tree-sha1 = "3fd1a3022952128935b449c33552eb65895380c1"
+deps = ["CSTParser", "Compat", "DataStructures", "Test"]
+git-tree-sha1 = "daecd9e452f38297c686eba90dba2a6d5da52162"
 uuid = "1914dd2f-81c6-5fcd-8719-6d5c9610ff09"
-version = "0.4.5"
+version = "0.5.0"
 
 [[Markdown]]
 deps = ["Base64"]
@@ -167,9 +173,9 @@ uuid = "a63ad114-7e13-5084-954f-fe012c677804"
 
 [[NNlib]]
 deps = ["Libdl", "LinearAlgebra", "MacroTools", "Requires", "Test"]
-git-tree-sha1 = "51330bb45927379007e089997bf548fbe232589d"
+git-tree-sha1 = "9ac5cd21484189339b27840818c4882d1b6df7fd"
 uuid = "872c559c-99b0-510c-b3b7-b6c96a88d5cd"
-version = "0.4.3"
+version = "0.5.0"
 
 [[NaNMath]]
 deps = ["Compat"]
@@ -179,9 +185,9 @@ version = "0.3.2"
 
 [[OrderedCollections]]
 deps = ["Random", "Serialization", "Test"]
-git-tree-sha1 = "85619a3f3e17bb4761fe1b1fd47f0e979f964d5b"
+git-tree-sha1 = "c4c13474d23c60d20a67b217f1d7f22a40edf8f1"
 uuid = "bac558e1-5e72-5ebc-8fee-abe8a469f55d"
-version = "1.0.2"
+version = "1.1.0"
 
 [[Pkg]]
 deps = ["Dates", "LibGit2", "Markdown", "Printf", "REPL", "Random", "SHA", "UUIDs"]
@@ -255,15 +261,21 @@ deps = ["LinearAlgebra", "SparseArrays"]
 uuid = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [[StatsBase]]
-deps = ["DataStructures", "DelimitedFiles", "LinearAlgebra", "Missings", "Printf", "Random", "SortingAlgorithms", "SparseArrays", "Statistics", "Test"]
-git-tree-sha1 = "435707791dc85a67d98d671c1c3fcf1b20b00f94"
+deps = ["DataStructures", "LinearAlgebra", "Missings", "Printf", "Random", "SortingAlgorithms", "SparseArrays", "Statistics"]
+git-tree-sha1 = "8a0f4b09c7426478ab677245ab2b0b68552143c7"
 uuid = "2913bbd2-ae8a-5f71-8c99-4fb6c76f3a91"
-version = "0.29.0"
+version = "0.30.0"
 
 [[Test]]
 deps = ["Distributed", "InteractiveUtils", "Logging", "Random"]
 uuid = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
+[[Tokenize]]
+deps = ["Printf", "Test"]
+git-tree-sha1 = "3e83f60b74911d3042d3550884ca2776386a02b8"
+uuid = "0796e94c-ce3b-5d07-9a54-7f471281c624"
+version = "0.5.3"
+
 [[Tracker]]
 deps = ["Adapt", "DiffRules", "ForwardDiff", "LinearAlgebra", "MacroTools", "NNlib", "NaNMath", "Printf", "Random", "Requires", "SpecialFunctions", "Statistics", "Test"]
 git-tree-sha1 = "4eeea9f0ef9b8c7d1c5c5b1f8f68cb9b7f45d7df"
@@ -271,10 +283,10 @@ uuid = "9f7883ad-71c0-57eb-9f7f-b5c9e6d3789c"
 version = "0.1.0"
 
 [[TranscodingStreams]]
-deps = ["Pkg", "Random", "Test"]
-git-tree-sha1 = "90f845c65c50bc57d6ffc815dbab2a4003ccf75c"
+deps = ["Random", "Test"]
+git-tree-sha1 = "a25d8e5a28c3b1b06d3859f30757d43106791919"
 uuid = "3bb67fe8-82b1-5028-8e26-92a6c54297fa"
-version = "0.9.1"
+version = "0.9.4"
 
 [[URIParser]]
 deps = ["Test", "Unicode"]
@@ -291,6 +303,6 @@ uuid = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
 
 [[ZipFile]]
 deps = ["BinaryProvider", "Libdl", "Printf", "Test"]
-git-tree-sha1 = "4000c633efe994b2e10b31b6d91382c4b7412dac"
+git-tree-sha1 = "5f6f663890dfb9bad6af75a86a43f67904e5050e"
 uuid = "a5390f91-8eb1-5f08-bee0-b1d1ffed6cea"
-version = "0.8.0"
+version = "0.8.1"
diff --git a/docs/src/models/basics.md b/docs/src/models/basics.md
index 12c682e1..3b7b2a8e 100644
--- a/docs/src/models/basics.md
+++ b/docs/src/models/basics.md
@@ -47,10 +47,10 @@ julia> f(x) = W * x + b;
 julia> grads = Tracker.gradient(() -> f(4), params(W, b));
 
 julia> grads[W]
-4.0
+4.0 (tracked)
 
 julia> grads[b]
-1.0
+1.0 (tracked)
 ```
 
 There are a few things to notice here. Firstly, `W` and `b` now show up as *tracked*. Tracked things behave like normal numbers or arrays, but keep records of everything you do with them, allowing Flux to calculate their gradients. `gradient` takes a zero-argument function; no arguments are necessary because the `params` tell it what to differentiate.