diff --git a/src/cargo/core/registry.rs b/src/cargo/core/registry.rs
index 517486801d2..c1200fd36a2 100644
--- a/src/cargo/core/registry.rs
+++ b/src/cargo/core/registry.rs
@@ -194,7 +194,9 @@ impl<'cfg> PackageRegistry<'cfg> {
             let summary = match summaries.next() {
                 Some(summary) => summary,
                 None => {
-                    bail!("patch for `{}` in `{}` did not resolve to any crates",
+                    bail!("patch for `{}` in `{}` did not resolve to any crates. If this is \
+                           unexpected, you may wish to consult: \
+                           https://github.com/rust-lang/cargo/issues/4678",
                           dep.name(), url)
                 }
             };