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-rw-r--r--public/fpdfview.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/public/fpdfview.h b/public/fpdfview.h
index c74fcb99d0..135d00a8f4 100644
--- a/public/fpdfview.h
+++ b/public/fpdfview.h
@@ -666,7 +666,7 @@ FPDF_EXPORT void FPDF_CALLCONV FPDF_RenderPageBitmap(FPDF_BITMAP bitmap,
// by FPDFBitmap_Create or retrieved by
// FPDFImageObj_GetBitmap.
// page - Handle to the page. Returned by FPDF_LoadPage
-// matrix - The transform matrix.
+// matrix - The transform matrix. It must be invertible.
// clipping - The rect to clip to.
// flags - 0 for normal display, or combination of the Page
// Rendering flags defined above. With the FPDF_ANNOT
@@ -674,7 +674,7 @@ FPDF_EXPORT void FPDF_CALLCONV FPDF_RenderPageBitmap(FPDF_BITMAP bitmap,
// user-interaction, which are all annotations except
// widget and popup annotations.
// Return value:
-// None.
+// None. Note that behavior is undefined if det of |matrix| is 0.
FPDF_EXPORT void FPDF_CALLCONV
FPDF_RenderPageBitmapWithMatrix(FPDF_BITMAP bitmap,
FPDF_PAGE page,