Identify parser functions as conditional
diff --git a/src/path.rs b/src/path.rs
index fea3b0f..4872187 100644
--- a/src/path.rs
+++ b/src/path.rs
@@ -348,6 +348,9 @@
     impl Path {
         /// Parse a `Path` containing no path arguments on any of its segments.
         ///
+        /// *This function is available if Syn is built with the `"parsing"`
+        /// feature.*
+        ///
         /// # Example
         ///
         /// ```