diff --git a/src/lib/fs/conffile.c b/src/lib/fs/conffile.c
index 1f58a3590c..acd8dfb8cc 100644
--- a/src/lib/fs/conffile.c
+++ b/src/lib/fs/conffile.c
@@ -53,10 +53,10 @@ config_get_lines_include(const char *string, config_line_t **result,
                               opened_lst, 1, NULL, config_process_include);
 }
 
-/** Returns a list of paths obtained when expading globs in <b>pattern</b>. If
- * <b>pattern</b> has no globs, returns a list with <b>pattern</b> if it is an
- * existing path or NULL otherwise. If <b>opened_files</b> is provided, adds
- * paths opened by glob to it. Returns NULL on failure. */
+/** Return a list of paths obtained when expading globs in <b>pattern</b>.
+ * If <b>pattern</b> has no globs, return a list with <b>pattern</b> in it.
+ * If <b>opened_files</b> is provided, add paths opened by glob to it.
+ * Return NULL on failure. */
 static smartlist_t *
 expand_glob(const char *pattern, smartlist_t *opened_files)
 {
diff --git a/src/lib/sandbox/sandbox.c b/src/lib/sandbox/sandbox.c
index d9ad8ec2c6..168dfd943c 100644
--- a/src/lib/sandbox/sandbox.c
+++ b/src/lib/sandbox/sandbox.c
@@ -1229,7 +1229,9 @@ static sandbox_filter_func_t filter_func[] = {
 /**
  * Return the interned (and hopefully sandbox-permitted) string equal
  * to @a str.
- */
+ *
+ * Return NULL if `str` is NULL, or `str` is not an interned string.
+ **/
 const char *
 sandbox_intern_string(const char *str)
 {