1 files changed, 4 insertions, 0 deletions
diff --git a/src/nvim/os/input.c b/src/nvim/os/input.c
index a673a6c8b8..95afa95d61 100644
--- a/src/nvim/os/input.c
+++ b/src/nvim/os/input.c
@@ -124,6 +124,10 @@ void os_breakcheck()
     fill_input_buf(false);
 }
 
+/// Test whether a file descriptor refers to a terminal.
+///
+/// @param fd File descriptor.
+/// @return `true` if file descriptor refers to a terminal.
 bool os_isatty(int fd)
 {
     return uv_guess_handle(fd) == UV_TTY;