diff --git a/doc/lisp_reference/all-functions-present.sh b/doc/lisp_reference/all-functions-present.sh
new file mode 100755
index 0000000..b2623ab
--- /dev/null
+++ b/doc/lisp_reference/all-functions-present.sh
@@ -0,0 +1,13 @@
+#!/bin/sh
+
+# Prints a list of the functions that are not yet documented.
+
+../../src/lisp/lisp all-functions.lisp | while read -r fun
+do
+	if grep "$fun" lisp_reference.tex > /dev/null; then
+		# nothing
+		true
+	else
+		echo "$fun"
+	fi
+done
diff --git a/doc/lisp_reference/all-functions.lisp b/doc/lisp_reference/all-functions.lisp
new file mode 100644
index 0000000..0659c3d
--- /dev/null
+++ b/doc/lisp_reference/all-functions.lisp
@@ -0,0 +1,5 @@
+;; Prints all defined Lisp functions
+(defun main ()
+  (mapcar (lambda (fun)
+			(print fun))
+		  (env-functions +current-env+)))
diff --git a/doc/lisp_reference/lisp_reference.tex b/doc/lisp_reference/lisp_reference.tex
index 11b2207..0f204b9 100644
--- a/doc/lisp_reference/lisp_reference.tex
+++ b/doc/lisp_reference/lisp_reference.tex
@@ -389,6 +389,40 @@
   not compiling a file. Return \ret{\nil}.
 }
 
+\section{Inspecting \& Modifying the Environment}
+
+\subsection{Managing Memory}
+
+\definition{
+  (\func{gc})\index{gc}
+}{
+  Run the garbage collector.
+}
+
+\definition{
+  (\func{gc-stats})\index{gc-stats}
+}{
+  Return some
+  statistics about the garbage collector, in the form of a list:
+  \ret{(\param{total-allocs} \param{gc-runs})}, where
+  \param{total-allocs} is the current number of active allocations,
+  and \param{gc-runs} is the total number of times the garbage
+  collector has been run.
+}
+
+\subsection{Introspection}
+
+\definition{ \const{\pluses{current-env}} }{ An opaque object
+  representing the current environment.  }
+
+\definition{
+  (\func{env-functions} \param{current-env})
+}{
+  Returns a
+  list of symbols, each of which is the name of a function defined in
+  the environment specified by \param{current-env}.
+}
+
 \printindex
 
 \printglossaries