diff --git a/src/librustc/session/config.rs b/src/librustc/session/config.rs
index f079d7d43389a..e1107a9b97fce 100644
--- a/src/librustc/session/config.rs
+++ b/src/librustc/session/config.rs
@@ -938,7 +938,7 @@ options! {CodegenOptions, CodegenSetter, basic_codegen_options,
     debug_assertions: Option<bool> = (None, parse_opt_bool, [TRACKED],
         "explicitly enable the cfg(debug_assertions) directive"),
     inline_threshold: Option<usize> = (None, parse_opt_uint, [TRACKED],
-        "set the inlining threshold for"),
+        "set the threshold for inlining a function (default: 225)"),
     panic: Option<PanicStrategy> = (None, parse_panic_strategy,
         [TRACKED], "panic strategy to compile crate with"),
 }
@@ -1085,9 +1085,9 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
     linker_flavor: Option<LinkerFlavor> = (None, parse_linker_flavor, [UNTRACKED],
                                            "Linker flavor"),
     fuel: Option<(String, u64)> = (None, parse_optimization_fuel, [TRACKED],
-        "Set the optimization fuel quota for a crate."),
+        "set the optimization fuel quota for a crate"),
     print_fuel: Option<String> = (None, parse_opt_string, [TRACKED],
-        "Make Rustc print the total optimization fuel used by a crate."),
+        "make Rustc print the total optimization fuel used by a crate"),
     remap_path_prefix_from: Vec<String> = (vec![], parse_string_push, [TRACKED],
         "add a source pattern to the file path remapping config"),
     remap_path_prefix_to: Vec<String> = (vec![], parse_string_push, [TRACKED],