diff --git a/src/library/doc/doc.texi b/src/library/doc/doc.texi
index cfc7069..c295d95 100644
--- a/src/library/doc/doc.texi
+++ b/src/library/doc/doc.texi
@@ -2620,14 +2620,14 @@ myprogram:setuniformsurface(location, mysurface)
 @subsection setuniformdepthbuffer
 
 Sets the depth buffer as a uniform value. This will usually be used for
-sampler2D variables. This function requires a rendergameview event
-object and, as such, it may only be called during a callback for that
-event.
+sampler2D variables. This function works like all other setuniform
+functions, but requiring a rendergameview event as the second argument,
+and, as such, it may only be called during an onrendergameview event.
 
 @example lua
 @verbatim
 bolt.onrendergameview(function (event)
-  myprogram:setuniformdepthbuffer(event, location)
+  myprogram:setuniformdepthbuffer(location, event)
 end)
 @end verbatim
 @end example
@@ -2637,8 +2637,9 @@ depth buffer. The depth buffer is like a normal surface, but not exactly
 the same: a normal surface has internal contents of format GL_RGBA,
 whereas the depth buffer has contents of format GL_DEPTH_COMPONENT32F.
 This means that while it can be sampled in a sampler2D like any other
-surface, the R, G and B components will always be the same value, and
-the alpha component will always be 1.
+surface, the R component will contain the depth value for that pixel,
+the G and B components will be undefined, and the A component will
+usually be 1.0.
 
 The depth component of any given pixel represents the Z-value of
 whatever was drawn on that pixel, and is used by the game to ensure that
diff --git a/src/library/plugin/plugin_api.c b/src/library/plugin/plugin_api.c
index 309cdad..5a9f614 100644
--- a/src/library/plugin/plugin_api.c
+++ b/src/library/plugin/plugin_api.c
@@ -2200,8 +2200,8 @@ static int api_shaderprogram_setuniformsurface(lua_State* state) {
 
 static int api_shaderprogram_setuniformdepthbuffer(lua_State* state) {
     struct ShaderProgramFunctions* program = require_self_userdata(state, "setuniformdepthbuffer");
-    const struct RenderGameViewEvent* event = require_userdata(state, 2, "setuniformdepthbuffer");
-    const lua_Integer location = luaL_checkinteger(state, 3);
+    const lua_Integer location = luaL_checkinteger(state, 2);
+    const struct RenderGameViewEvent* event = require_userdata(state, 3, "setuniformdepthbuffer");
     program->set_uniform_depthbuffer(program->userdata, event->functions.userdata, location);
     return 0;
 }