diff --git a/imageio/webpdec.h b/imageio/webpdec.h
index 6db801f6..d329d41f 100644
--- a/imageio/webpdec.h
+++ b/imageio/webpdec.h
@@ -51,7 +51,7 @@ VP8StatusCode DecodeWebPIncremental(
 
 //------------------------------------------------------------------------------
 
-// Reads a WebP from 'in_file', returning the decoded output in 'pic'.
+// Decodes a WebP contained in 'data', returning the decoded output in 'pic'.
 // Output is RGBA or YUVA, depending on pic->use_argb value.
 // If 'keep_alpha' is true and the WebP has an alpha channel, the output is RGBA
 // or YUVA. Otherwise, alpha channel is dropped and output is RGB or YUV.