diff --git a/DESCRIPTION b/DESCRIPTION
index d768703..b64a33b 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,5 +1,5 @@
 Package: codetools
-Version: 0.2-15
+Version: 0.2-16
 Priority: recommended
 Author: Luke Tierney <luke-tierney@uiowa.edu>
 Description: Code analysis tools for R.
@@ -8,6 +8,6 @@ Depends: R (>= 2.1)
 Maintainer: Luke Tierney <luke-tierney@uiowa.edu>
 License: GPL
 NeedsCompilation: no
-Packaged: 2016-10-05 12:32:32 UTC; luke
+Packaged: 2018-12-22 14:48:17 UTC; luke
 Repository: CRAN
-Date/Publication: 2016-10-05 16:36:47
+Date/Publication: 2018-12-24 12:40:05 UTC
diff --git a/MD5 b/MD5
index 848cd07..51faa5d 100644
--- a/MD5
+++ b/MD5
@@ -1,8 +1,8 @@
-dfa8498b455155a5b2fc59c318c55f3f *DESCRIPTION
+e48906bf15c7ce12219499d2ef9a442a *DESCRIPTION
 d7d4587719d6cbb3083123501ec23dd3 *NAMESPACE
-e1a0def8009a2bc24365d7c1d0e9111d *R/codetools.R
+898067d87a5ce3373b6a5b83c150746c *R/codetools.R
 2af77179b93b37abb2717ba0dacd60a3 *man/checkUsage.Rd
-215ca204e6c7206111e585206cee095c *man/codetools.Rd
-31aabac379a9264e4ce819755b95b601 *man/findGlobals.Rd
+722f473fac8f4c14d9fc199953daab44 *man/codetools.Rd
+29fbed23cf38b444df2df0ce0389946b *man/findGlobals.Rd
 7915e973bb95db1197db9152d339f2c8 *man/showTree.Rd
 838118aa4116e6b2d66e393dae8e4073 *tests/tests.R
diff --git a/R/codetools.R b/R/codetools.R
index 3a8715a..b492597 100644
--- a/R/codetools.R
+++ b/R/codetools.R
@@ -376,8 +376,10 @@ makeUsageCollector <- function(fun, ..., name = NULL,
                                finishCollectLocals = doNothing,
                                warn = warning0,
                                signal = signalUsageIssue) {
-    if (typeof(fun) != "closure")
-        stop("only works for closures")
+    if (typeof(fun) == "closure")
+        env <- environment(fun)
+    else
+        env <- .GlobalEnv
     makeCodeWalker(..., name = name,
                    enterLocal = enterLocal,
                    enterGlobal = enterGlobal,
@@ -389,8 +391,8 @@ makeUsageCollector <- function(fun, ..., name = NULL,
                    leaf = collectUsageLeaf,
                    call = collectUsageCall,
                    handler = getCollectUsageHandler,
-                   globalenv = environment(fun),
-                   env = environment(fun),
+                   globalenv = env,
+                   env = env,
                    name = NULL,
                    srcfile = NULL,
                    frow = NULL,
@@ -764,7 +766,7 @@ addCollectUsageHandler("if", "base", function(e, w) {
 })
 
 ##
-## Finding globa variables
+## Finding global variables
 ##
 
 findGlobals <- function(fun, merge = TRUE) {
diff --git a/man/codetools.Rd b/man/codetools.Rd
index 5dd5b91..d2057ed 100644
--- a/man/codetools.Rd
+++ b/man/codetools.Rd
@@ -61,7 +61,7 @@ walkCode(e, w = makeCodeWalker())
 }
 \description{
   These functions provide some tools for analysing R code.  Mainly
-  indented to support the other tools in this package and byte code
+  intended to support the other tools in this package and byte code
   compilation.
 }
 \author{Luke Tierney}
diff --git a/man/findGlobals.Rd b/man/findGlobals.Rd
index 111d08b..2aeea2b 100644
--- a/man/findGlobals.Rd
+++ b/man/findGlobals.Rd
@@ -5,12 +5,13 @@ findGlobals(fun, merge = TRUE)
 }
 \alias{findGlobals}
 \arguments{
-  \item{fun}{closure.}
+  \item{fun}{function object; usually a closure.}
   \item{merge}{logical}
 }
 \value{
   Character vector if \code{merge} is true; otherwise, a list with
-  \code{functions} and \code{variables} components.
+  \code{functions} and \code{variables} character vector components.
+  Character vectors are of length zero For non-closures.
 }
 \description{
   Finds global functions and variables used by a closure.