diff --git a/README.md b/README.md
index 43b00f2c44ada674a650b7a00534fe21983da09d..fe0d438308067d23e23b888f43a864cff0d8e656 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,8 @@ We are providing our manual for Ion in the form of a markdown-based book, which
 
 ### Code Formatting
 
-When submitting a pull request, be sure to run `cargo +nightly fmt` on your project with a
+When submitting a pull request, be sure to run
+`env CFG_RELEASE_CHANNEL=nightly cargo +nightly fmt` on your project with a
 nightly version of **rustfmt**. This will prevent me from having to push PR's specifically
 to format the code base from time to time. To install **rustfmt-nightly**, simply run
 `cargo install rustfmt-nightly --force`.
diff --git a/rustfmt.toml b/rustfmt.toml
index 7bbf6f6e1dc9738a86b897c8e353f4e758a96f2d..1f9ec585512bcee8606712217397d3e4f43bcda9 100644
--- a/rustfmt.toml
+++ b/rustfmt.toml
@@ -1,3 +1,4 @@
+unstable_features = true
 array_horizontal_layout_threshold = 100
 array_width = 100
 attributes_on_same_line_as_field = false
@@ -6,7 +7,7 @@ chain_one_line_max = 100
 chain_width = 100
 comment_width = 100
 condense_wildcard_suffixes = true
-error_on_line_overflow = false
+error_on_line_overflow_comments = false
 fn_call_width = 100
 fn_single_line = true
 format_strings = true
@@ -22,4 +23,4 @@ struct_field_align_threshold = 30
 struct_lit_width = 100
 where_style = "legacy"
 wrap_comments = true
-write_mode = "overwrite"
\ No newline at end of file
+write_mode = "overwrite"