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diff --git a/src/mds-kbdc/variables.h b/src/mds-kbdc/variables.h
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+/**
+ * mds — A micro-display server
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef MDS_MDS_KBDC_VARIABLES_H
+#define MDS_MDS_KBDC_VARIABLES_H
+
+
+#include "parsed.h"
+#include "string.h"
+
+
+
+/**
+ * Destroy the variable storage
+ */
+void variables_terminate(void);
+
+/**
+ * Push the variable-stack, making it
+ * possible to shadow all variables
+ * 
+ * @return  Zero on success, -1 on error
+ */
+void variables_stack_push(void);
+
+/**
+ * Undo the actions of `variables_stack_push`
+ * and all additions to the variable storage
+ * since it was last called (without a
+ * corresponding call to this function)
+ */
+void variables_stack_pop(void);
+
+/**
+ * Check whether a let will override a variable
+ * rather the define or shadow it
+ * 
+ * @param   variable  The variable index
+ * @return            Whether a let will override the variable
+ */
+int variables_let_will_override(size_t variable) __attribute__((pure));
+
+/**
+ * Assign a value to a variable, and define or shadow it in the process
+ * 
+ * @param   variable  The variable index
+ * @param   value     The variable's new value
+ * @return            Zero on success, -1 on error
+ */
+int variables_let(size_t variable, mds_kbdc_tree_t* restrict value);
+
+/**
+ * Get the value currently assigned to a variable
+ * 
+ * The function cannot fail, `NULL` is however returned
+ * if the variable is not defined
+ * 
+ * @param   variable  The variable index
+ * @return            The variable's value, `NULL` if not defined
+ */
+mds_kbdc_tree_t* variables_get(size_t variable) __attribute__((pure));
+
+
+
+#endif
+