diff --git a/man/cwebp.1 b/man/cwebp.1
index 132359cd..0d7c1a63 100644
--- a/man/cwebp.1
+++ b/man/cwebp.1
@@ -12,9 +12,7 @@ This manual page documents the
 command.
 .PP
 \fBcwebp\fP compresses an image using the WebP format.
-Input format can be either PNG, JPEG, or raw Y'CbCr samples.
-When using PNG, the transparency information (alpha channel) is currently
-discarded.
+Input format can be either PNG, JPEG, TIFF or raw Y'CbCr samples.
 .SH OPTIONS
 The basic options are:
 .TP
@@ -41,14 +39,6 @@ Specify the compression factor for alpha compression between 0 and 100.
 Lossless compression of alpha is achieved using a value of 100, while the lower
 values result in a lossy compression. The default is 100.
 .TP
-.B \-alpha_filter string
-Specify the predictive filtering method for alpha plane. One of 'none', 'fast'
-or 'best', in increasing complexity and slowness order. Default is 'fast'.
-Internally, alpha filtering is performed using four possible predictions (none,
-horizontal, vertical, gradient). The 'best' mode will try each modes in turn and
-pick the one which gives the smaller size. The 'fast' mode will just try to
-form an a-priori guess without testing all modes.
-.TP
 .B \-f int
 Specify the strength of the deblocking filter, between 0 (no filtering)
 and 100 (maximum filtering). A value of 0 will turn off any filtering.
@@ -129,7 +119,7 @@ Compressor will make several pass of partial encoding in order to get as
 close as possible to this target.
 .TP
 .B \-pass int
-Set a maximum number of pass to use during the dichotomy used by
+Set a maximum number of passes to use during the dichotomy used by
 options \fB\-size\fP or \fB\-psnr\fP. Maximum value is 10.
 .TP
 .B \-crop x_position y_position width height
@@ -150,10 +140,17 @@ range from 1 to 6. This is only meant to help debugging.
 Specify a pre-processing filter. This option is a placeholder
 and has currently no effect.
 .TP
+.B \-alpha_filter string
+Specify the predictive filtering method for alpha plane. One of 'none', 'fast'
+or 'best', in increasing complexity and slowness order. Default is 'fast'.
+Internally, alpha filtering is performed using four possible predictions (none,
+horizontal, vertical, gradient). The 'best' mode will try each modes in turn and
+pick the one which gives the smaller size. The 'fast' mode will just try to
+form an a-priori guess without testing all modes.
+.TP
 .B \-alpha_method int
 Specify the algorithm used for alpha compression: 0 or 1. Algorithm 0 denotes
-no compression, 1 uses uses backward reference counts encoded with arithmetic
-encoder. The default is 1.
+no compression, 1 uses WebP lossless format for compression. The default is 1.
 .TP
 .B \-alpha_cleanup
 Modify unseen RGB values under fully transparent area, to help compressibility.
@@ -198,7 +195,9 @@ Patches welcome! See this page to get started:
 http://www.webmproject.org/code/contribute/submitting-patches/
 
 .SH EXAMPLES
-cwebp \-q 70 picture.png \-o picture.webp
+cwebp \-q 50 -lossless picture.png \-o picture_lossless.webp
+.br
+cwebp \-q 70 picture_with_alpha.png \-o picture_with_alpha.webp
 .br
 cwebp \-sns 70 \-f 50 \-strong \-af \-size 60000 picture.png \-o picture.webp