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-rw-r--r--DOCS/man/vo.rst6
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diff --git a/DOCS/man/vo.rst b/DOCS/man/vo.rst
index bc0dd9fd12..4f2641a11e 100644
--- a/DOCS/man/vo.rst
+++ b/DOCS/man/vo.rst
@@ -657,7 +657,11 @@ Available video output drivers are:
These files must define a function with the following signature::
- vec4 sample(sampler2D tex, vec2 pos, vec2 tex_size)
+ vec4 sample_pixel(sampler2D tex, vec2 pos, vec2 tex_size)
+
+ (If there is no string ``sample_pixel`` in the shader script, it will
+ use ``sample`` instead. This is a compatibility hack for older shader
+ scripts, and is deprecated.)
The meanings of the parameters are as follows: