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-rw-r--r--src/librustdoc/clean/cfg.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/librustdoc/clean/cfg.rs b/src/librustdoc/clean/cfg.rs
index b6ce8551060..e204e1788ba 100644
--- a/src/librustdoc/clean/cfg.rs
+++ b/src/librustdoc/clean/cfg.rs
@@ -486,6 +486,7 @@ impl fmt::Display for Display<'_> {
                     (sym::debug_assertions, None) => "debug-assertions enabled",
                     (sym::target_os, Some(os)) => match os.as_str() {
                         "android" => "Android",
+                        "cygwin" => "Cygwin",
                         "dragonfly" => "DragonFly BSD",
                         "emscripten" => "Emscripten",
                         "freebsd" => "FreeBSD",