diff --git a/docs/make.jl b/docs/make.jl
index 33aa31b..6f4a304 100644
--- a/docs/make.jl
+++ b/docs/make.jl
@@ -32,6 +32,7 @@ makedocs(;
                 "Controlled DC motor" => "examples/dc_motor_pi.md",
              ],
              "Block library" => "blocks.md",
+             "Functions" => "api.md",
          ],
 )
 
diff --git a/docs/src/api.md b/docs/src/api.md
new file mode 100644
index 0000000..c1467f7
--- /dev/null
+++ b/docs/src/api.md
@@ -0,0 +1,13 @@
+# API
+
+## Index
+```@index
+```
+
+## Docstrings
+
+```@docs
+ModelingToolkit.Sample
+ModelingToolkit.Hold
+ModelingToolkit.ShiftIndex
+```
\ No newline at end of file