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-rw-r--r--doc/client_lua_api.txt2
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/client_lua_api.txt b/doc/client_lua_api.txt
index 5651898aa..bdefa3af5 100644
--- a/doc/client_lua_api.txt
+++ b/doc/client_lua_api.txt
@@ -609,6 +609,8 @@ Helper functions
* Converts a string representing an area box into two positions
* `minetest.is_yes(arg)`
* returns whether `arg` can be interpreted as yes
+* `minetest.is_nan(arg)`
+ * returns true true when the passed number represents NaN.
* `table.copy(table)`: returns a table
* returns a deep copy of `table`