diff --git a/lib/matplotlib/image.py b/lib/matplotlib/image.py
index 342a8b663372..7cf91b468aa5 100644
--- a/lib/matplotlib/image.py
+++ b/lib/matplotlib/image.py
@@ -1547,7 +1547,15 @@ def imread(fname, format=None):
def imsave(fname, arr, vmin=None, vmax=None, cmap=None, format=None,
origin=None, dpi=100, *, metadata=None, pil_kwargs=None):
"""
- Save an array as an image file.
+ Colormap and save an array as an image file.
+
+ RGB(A) images are passed through. Single channel images will be
+ colormapped according to *cmap* and *norm*.
+
+ .. note ::
+
+ If you want to save a single channel image as gray scale please use an
+ image I/O library (such as pillow, tifffile, or imageio) directly.
Parameters
----------
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