diff --git a/tech/development.wiki b/tech/development.wiki
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--- a/tech/development.wiki
+++ b/tech/development.wiki
@@ -11,6 +11,7 @@
 * [[libcurl|Libcurl]] - Curl the tool, but the API
 * [[periodictable|Periodic Table]] - Python periodic table
 * [[ffmpeg]] - video/media library
+* [[libmpv]] - client library for the MPV video player
 
 == Tools ==
 
diff --git a/tech/libmpv.wiki b/tech/libmpv.wiki
new file mode 100644
index 0000000..a89d8e5
--- /dev/null
+++ b/tech/libmpv.wiki
@@ -0,0 +1,18 @@
+= Libmpv =
+
+The full documentation can be found in `/usr/include/mpv/client.h`. The library
+treats its own source as documentation. When installing mpv, libmpv is usually
+installed as well. Libmpv is a C library.
+
+== Handle ==
+
+MPV provides a `mpv_handle`, which is a client context used by the client API.
+Every client has its own private handle.
+
+The handle can be queried with `const char *mpv_client_name(mpv_handle*)` which
+returns the handle name. The returned string is read only and valid for the
+lifetime of the handle.
+
+The handle has a unique client ID, and can be queried with
+`int64_t mpv_client_id(mpv_handle)`. The ID is never reused, and is never 0 or
+negative.