docs: clarify that -e/--extension matches all entry types

README.md

@@ -328,7 +328,7 @@ Options:
   -t, --type <filetype>            Filter by type: file (f), directory (d/dir), symlink (l),
                                    executable (x), empty (e), socket (s), pipe (p), char-device
                                    (c), block-device (b)
-  -e, --extension <ext>            Filter by file extension
+  -e, --extension <ext>            Filter by extension
   -S, --size <size>                Limit results based on the size of files
       --changed-within <date|dur>  Filter by file modification time (newer than)
       --changed-before <date|dur>  Filter by file modification time (older than)

doc/fd.1

@@ -250,9 +250,11 @@ Examples:
 .RE
 .TP
 .BI "\-e, \-\-extension " ext
-Filter search results by file extension
+Filter search results by extension
 .IR ext .
-This option can be used repeatedly to allow for multiple possible file extensions.
+This option can be used repeatedly to allow for multiple possible extensions.
+By default, extension filters apply to both files and directories. Use
+\fB\-\-type\fR to restrict the search to specific types.
 
 If you want to search for files without extension, you can use the regex '^[^.]+$'
 as a normal search pattern.

src/cli.rs

@@ -364,16 +364,17 @@ pub struct Opts {
     )]
     pub filetype: Option<Vec<FileType>>,
 
-    /// (Additionally) filter search results by their file extension. Multiple
-    /// allowable file extensions can be specified.
+    /// Filter results by extension. By default, this matches all entry types
+    /// (including directories whose names end with the extension). Use `--type`
+    /// to restrict the search to specific types. Multiple extensions can be specified.
     ///
     /// If you want to search for files without extension,
     /// you can use the regex '^[^.]+$' as a normal search pattern.
     #[arg(
         long = "extension",
         short = 'e',
         value_name = "ext",
-        help = "Filter by file extension",
+        help = "Filter by extension",
         long_help
     )]
     pub extensions: Option<Vec<String>>,