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diff --git a/common/action_oneshot.h b/common/action_oneshot.h
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+++ b/common/action_oneshot.h
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+/*
+Copyright 2013 Jun Wako <wakojun@gmail.com>
+
+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 2 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 ACTION_ONESHOT_H
+#define ACTION_ONESHOT_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#ifdef NO_ACTION_TAPPING
+    #define NO_ACTION_ONESHOT
+#endif
+
+#ifndef NO_ACTION_ONESHOT
+/* Oneshot modifier
+ *
+ * Problem: Want to capitalize like 'The' but the result tends to be 'THe'.
+ * Solution: Oneshot modifier have its effect on only one key coming next.
+ *           Tap Shift, then type 't', 'h' and 'e'. Not need to hold Shift key.
+ *
+ *  Hold:       works as normal modifier.
+ *  Tap:        one shot modifier.
+ *  2 Tap:      cancel one shot modifier.
+ *  5-Tap:      toggles enable/disable oneshot feature.
+ */
+typedef struct {
+    uint8_t mods;
+    bool    disabled;
+}   oneshot_state_t;
+
+
+oneshot_state_t oneshot_state;
+
+void oneshot_start(uint8_t mods);
+void oneshot_cancel(void);
+void oneshot_toggle(void);
+#endif
+
+#endif