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-rw-r--r--process.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/process.c b/process.c
index 88606c3..c52e6ac 100644
--- a/process.c
+++ b/process.c
@@ -3950,6 +3950,8 @@ rb_f_system(int argc, VALUE *argv)
* env: hash
* name => val : set the environment variable
* name => nil : unset the environment variable
+ *
+ * the keys must be strings.
* command...:
* commandline : command line string which is passed to the standard shell
* cmdname, arg1, ... : command name and one or more arguments (This form does not use the shell. See below for caveats.)