diff --git a/compiler/rustc_session/src/filesearch.rs b/compiler/rustc_session/src/filesearch.rs
index 6fe6a555f1af8..a9999e1d92197 100644
--- a/compiler/rustc_session/src/filesearch.rs
+++ b/compiler/rustc_session/src/filesearch.rs
@@ -1,3 +1,5 @@
+//! A module for searching for libraries
+
 pub use self::FileMatch::*;
 
 use std::env;
@@ -14,8 +16,6 @@ pub enum FileMatch {
     FileDoesntMatch,
 }
 
-// A module for searching for libraries
-
 #[derive(Clone)]
 pub struct FileSearch<'a> {
     sysroot: &'a Path,
@@ -83,12 +83,12 @@ impl<'a> FileSearch<'a> {
         FileSearch { sysroot, triple, search_paths, tlib_path, kind }
     }
 
-    // Returns just the directories within the search paths.
+    /// Returns just the directories within the search paths.
     pub fn search_path_dirs(&self) -> Vec<PathBuf> {
         self.search_paths().map(|sp| sp.dir.to_path_buf()).collect()
     }
 
-    // Returns a list of directories where target-specific tool binaries are located.
+    /// Returns a list of directories where target-specific tool binaries are located.
     pub fn get_tools_search_paths(&self, self_contained: bool) -> Vec<PathBuf> {
         let rustlib_path = rustc_target::target_rustlib_path(self.sysroot, &self.triple);
         let p = std::array::IntoIter::new([
@@ -107,8 +107,8 @@ pub fn make_target_lib_path(sysroot: &Path, target_triple: &str) -> PathBuf {
         .collect::<PathBuf>()
 }
 
-// This function checks if sysroot is found using env::args().next(), and if it
-// is not found, uses env::current_exe() to imply sysroot.
+/// This function checks if sysroot is found using env::args().next(), and if it
+/// is not found, uses env::current_exe() to imply sysroot.
 pub fn get_or_default_sysroot() -> PathBuf {
     // Follow symlinks.  If the resolved path is relative, make it absolute.
     fn canonicalize(path: PathBuf) -> PathBuf {
diff --git a/compiler/rustc_session/src/search_paths.rs b/compiler/rustc_session/src/search_paths.rs
index 83b737a73b1e8..acb6c735e051e 100644
--- a/compiler/rustc_session/src/search_paths.rs
+++ b/compiler/rustc_session/src/search_paths.rs
@@ -9,17 +9,17 @@ pub struct SearchPath {
     pub files: Vec<SearchPathFile>,
 }
 
-// The obvious implementation of `SearchPath::files` is a `Vec<PathBuf>`. But
-// it is searched repeatedly by `find_library_crate`, and the searches involve
-// checking the prefix and suffix of the filename of each `PathBuf`. This is
-// doable, but very slow, because it involves calls to `file_name` and
-// `extension` that are themselves slow.
-//
-// This type augments the `PathBuf` with an `Option<String>` containing the
-// `PathBuf`'s filename. The prefix and suffix checking is much faster on the
-// `Option<String>` than the `PathBuf`. (It's an `Option` because
-// `Path::file_name` can fail; if that happens then all subsequent checking
-// will also fail, which is fine.)
+/// The obvious implementation of `SearchPath::files` is a `Vec<PathBuf>`. But
+/// it is searched repeatedly by `find_library_crate`, and the searches involve
+/// checking the prefix and suffix of the filename of each `PathBuf`. This is
+/// doable, but very slow, because it involves calls to `file_name` and
+/// `extension` that are themselves slow.
+///
+/// This type augments the `PathBuf` with an `Option<String>` containing the
+/// `PathBuf`'s filename. The prefix and suffix checking is much faster on the
+/// `Option<String>` than the `PathBuf`. (It's an `Option` because
+/// `Path::file_name` can fail; if that happens then all subsequent checking
+/// will also fail, which is fine.)
 #[derive(Clone, Debug)]
 pub struct SearchPathFile {
     pub path: PathBuf,