diff --git a/doc/client_lua_api.md b/doc/client_lua_api.md
index 260603971..a7b26c7c3 100644
--- a/doc/client_lua_api.md
+++ b/doc/client_lua_api.md
@@ -314,7 +314,8 @@ Minetest namespace reference
 Call these functions only at load time!
 
 * `minetest.register_globalstep(function(dtime))`
-    * Called every client environment step, usually interval of 0.1s
+    * Called every client environment step
+	* `dtime` is the time since last execution in seconds.
 * `minetest.register_on_mods_loaded(function())`
     * Called just after mods have finished loading.
 * `minetest.register_on_shutdown(function())`
diff --git a/doc/lua_api.md b/doc/lua_api.md
index c733fc0a3..ac2304bca 100644
--- a/doc/lua_api.md
+++ b/doc/lua_api.md
@@ -5714,7 +5714,8 @@ Global callback registration functions
 Call these functions only at load time!
 
 * `minetest.register_globalstep(function(dtime))`
-    * Called every server step, usually interval of 0.1s
+    * Called every server step, usually interval of 0.1s.
+	* `dtime` is the time since last execution in seconds.
 * `minetest.register_on_mods_loaded(function())`
     * Called after mods have finished loading and before the media is cached or the
       aliases handled.