diff --git a/doc/src/references/builtin/Audio/Classes/sound/Properties/length.md b/doc/src/references/builtin/Audio/Classes/sound/Properties/length.md
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+++ b/doc/src/references/builtin/Audio/Classes/sound/Properties/length.md
@@ -0,0 +1,4 @@
+# length
+Get the length of a sound (in milliseconds).
+
+`float sound::length;`
diff --git a/doc/src/references/builtin/Audio/Classes/sound/Properties/sliding.md b/doc/src/references/builtin/Audio/Classes/sound/Properties/sliding.md
new file mode 100644
index 00000000..6ddb1b5d
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+++ b/doc/src/references/builtin/Audio/Classes/sound/Properties/sliding.md
@@ -0,0 +1,4 @@
+# sliding
+Determine if a sound is sliding or not.
+
+`sound::sliding;`